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SONiC native (CLICK) CLI is not updated for this feature. + +# Scope +This document describes the high-level design of Event and Alarm Framework. +It is not in the scope of the framework to update ANY of the applications to raise events and alarms. + +# 1 Feature Overview + +The Event and Alarm Framework feature provides a centralized framework for applications in SONiC to raise notifications and store them for north bound interfaces to listen and fetch to monitor the device. + +Events and Alarms are notifications to indicate a change in the state of the system that operator may be interested in. +Such a change has an important metric called *severity* to indicate how critical it is to the health of the system. + +* Events + + Events are "one shot" notifications to indicate an abnormal/important situation. + + User logging in, authentication failure, configuration changed notification are all examples of events. + +* Alarms + + Alarms are notifications raised for conditions that could be cleared by correcting or removal of such conditions. + + Out of memory, temperature crossing a threshold, and so on, are examples of conditions when the alarms are raised. + Such conditions are dynamic: a faulty software/hardware component encounters the above such condition and **may** come out of that situation when the condition is resolved. + + Events are sent as the condition progresses through being raised and cleared in addition to operator acknowledging/unacknowledging it. + So, these events have a field called *action*: RAISE, CLEAR or ACKNOWLEDGE/UNACKNOWLEDGE. + + Each of such events for an alarm is characterized by "action" in addition to "severity". + + An application *raises* an alarm when it encounters a faulty condition by sending an event with action: *RAISE*. + After the application recovers from the condition, that alarm is *cleared* by sending an event with action: *CLEAR*. + An operator could *ACKNOWLEDGE/UNACKNOWLEDGE* an alarm. This indicates that the operator is aware of the faulty condition. + + The set of alarms and their severities are an indication to health of various applications of the system and System LED can be deduced from alarms. + An acknowledged alarm means that operator is aware of the condition so, acknowledged alarm will be taken out of consideration. + +Both events and alarms get recorded in a new DB called EVENT DB in a new redis instance. + +1. Event Table + + All events get recorded in the event table, by name, "EVENT". EVENT table contains history of all events generated by the system. + This table is persisted across system restarts of any kind, including restore to factory defaults and SW upgrades and downgrades. + +2. Alarm Table + + All events with an action field of *RAISE* get recorded in a table, by name, "ALARM" in addition to getting recorded in Event Table ( only events corresponding to an alarm has action field ). + When an application that raised the alarm clears it ( by sending an event with action *CLEAR* ), the alarm record is removed from ALARM table. + A user acknowledging a particular alarm will NOT remove that alarm record from this table; only when application clears it, the alarm is removed from ALARM table. + + In effect, ALARM table contains outstanding alarms that need to be cleared by those applications who raised them. + This table is NOT persisted and its contents are cleared with a reload. + +In summary, the framework provides both current and historical event status of software and physical entities of the system through ALARM and EVENT tables. + +In addition to the above tables, the framework maintains various statisitcs. + +1. Event Statistics Table + + Statistics on number of events are maintained in EVENT_STATS table. + +2. Alarm Statistics Table + + Statistics on number of alarms per severity are maintained in ALARM_STATS table. + ALARM_STATS table is not persistent as conditions that triggers an alarm gets cleared on bootup. + When application raises an alarm, the counter corresponding to that alarm's severity is increased by 1. + When the alarm is cleared or acknowledged, the corresponding severity counter will be reduced by 1. + This table categorizes "active" alarms per severity. + +As mentioned above, each event has an important characteristic: severity. SONiC uses following severities as defined in opeconfig alarm yang. + +- CRITICAL : Requires immediate action. A critical event may trigger if one or more hardware components fail, or one or more hardware components exceed temperature thresholds. + ( maps to log-alert ) +- MAJOR : Requires escalation or notification. For example, a major alarm may trigger if an interface failure occurs, such as a port channel being down. + ( maps to log-critical ) +- MINOR : If left unchecked, might cause system service interruption or performance degradation. An alarm with minor severity requires monitoring or maintenance. + ( maps to log-error ) +- WARNING : It may or may not result in an error condition. + ( maps to log-warning ) +- INFORMATIONAL : Does not impact performance. NOT applicable to alarms. + ( maps to log-notice ) + +The following describes how an alarm transforms and how various tables are updated. +![Alarm Life Cycle](event-alarm-framework-alarm-lifecycle.png) + +By default every event will have a severity assigned by the component. The framework provides Event Profiles to customize severity of an event and also disable an event. + +Template for event profile is as below: +``` +{ + "events":[ + { + "name" : , + "severity" : , + "enable" : , + "message" : + } + ] +} +``` +Event Profiles only contains declarations of events and their characteristics. There has to be an application to raise these events using eventnotify API. + +The framework maintains default event profile at /etc/evprofile/default.json. +Operator can download default event profile to a remote host. +This downloaded file can be modified by changing the severity or enable flag of event(s). +This modified file can then be uploaded to the device to /etc/evprofile/. +Operator can select any of these custom event profiles to change default properties of events. +The selected profile is persistent across reboots and will be in effect until operator selects either default or another custom profile. + +In addition to storing events in DB, framework forwards log messages corresponding to all the events to syslog. +Syslog message displays the type (ALARM or EVENT), action (RAISE, CLEAR, ACKNOWLEDGE or UNACKNOWLEDGE) - when the message corresponds to an event of an alarm, name of the event and detailed message. + +gNMI clients can subscribe to receive events as they are raised. Subscribing through REST is being evaluated. + +CLI and REST/gNMI clients can query either table with filters - based on severity, delta based on timestamp, sequence-id etc., + +Application owners need to identify various conditions that would be of interest to the operator and use the framework to raise events/alarms. + +## 1.1 Requirements + + +### 1.1.1 Functional Requirements + +| ID | Requirement | Comment | +| :--- | :---- | :--- | +| 1 | Provide API via library for apps to publish events | | +| 2 | Provide API via library for apps to publish alarms | | +| 3 | Event Infra to write formatted syslog messages corresponding to all events to Syslog. | | +| 4 | Event Infra to persist all events and alarms in DB. | | +| 5 | Event Infra to read Event profile ( severity and enable/disable flag ) from a json file. | | +| 6 | Event Infra to read Event table parameters (size and # of days) from a config file. | | +| 7 | NBI interface (gNMI and REST) and CLI | | +| 7.1 | Events | | +| 7.1.1 | Openconfig interface to pull event information. | | +| 7.1.2 | Openconfig interface to pull event summary information. | | +| | Event summary information to contain cumulative counters for: | | +| | - Raised-count (events) | | +| 7.1.3 | Openconfig interface to pull events using following filters | | +| | - ALL ( pull all events) | | +| | - Severity. | | +| | - Recent records (eg., last 5 minutes, one hour, one day). | | +| | - Records between two timestamps, one timestamp and end, and beginning and a timestamp. | | +| | - All records between two Sequence Numbers (incl begin and end) | | +| 7.2 | Alarms | | +| 7.2.1 | Openconfig interface to pull alarm information. | | +| 7.2.2 | Openconfig interface to pull alarm summary information. | | +| | Counters for Total, Critical, Major, Minor, Warning, Acknowledged | | +| 7.2.3 | Openconfig interface to pull alarms using following filters | | +| | - All (pull all events) | | +| | - Severity. | | +| | - Recent alarms (eg., last 5 minutes, one hour, one day). | | +| | - Records between two timestamps, one timestamp and end, and beginning and a timestamp. | | +| | - All records between two Sequence Numbers (incl end and begin) | | +| 7.2.4 | Openconfig interface to acknowledge an alarm. | | +| 8 | CLI commands | | +| 8.1 | show alarm [ detail \| summary \| severity \| timestamp \| recent <5min\|1hr\|1day> \| sequence-number \| all] | | +| 8.2 | show event [ detail \| summary \| severity \| timestamp \| recent <5min\|1hr\|1day> \| sequence-number ] | | +| 8.3 | show event profile | | +| 8.4 | alarm acknowledge | | +| 8.5 | logging server [ log \| event ] | default is 'log' | +| 8.6 | event profile [ default \| name-of-file ] | | +| 9 | gNMI subscription | | +| 9.1 | Subscribe to openconfig Event container and Alarm container. All events and alarms published to gNMI subscribed clients. | | +| 10 | Clear all events | | +| 11 | Any change in open source should be aligned and upstream. | | + +## 1.2 Design Overview + +![Block Diagram](event-alarm-framework-blockdiag.png) + +### 1.2.1 Basic Approach +The feature involves new development. +Applications act as producers by writing to a table with the help of event notify library. +Eventd reads new record in the table and processes it: +It saves the entry in event table; if the event has an action and if it is *RAISE*, record gets added to alarm table, severity counter in ALARM_STATS is increased. +If the received event action is *CLEAR*, record in the ALARM table is removed and severity counter in ALARM_STATS of that alarm is reduced by 1. +If eventd receives an event with action *ACKNOWLEDGE* from mgmt-framework, severity counter in ALARM_STATS is reduced by 1. +If eventd receives an event with action *UNACKNOWLEDGE* from mgmt-framework, severity counter in ALARM_STATS is increased by 1. +Eventd then informs logging API to format the log message and send the message to syslog. + +Any application like pmon can subscribe to tables like ALARM_STATS to act accordingly. + +### 1.2.2 Container +A new container by name, eventd, is created to hold event consumer logic. + +# 2 Functionality +## 2.1 Target Deployment Use Cases + +The framework assigns an unique sequence number to each of the events sent by applications. + +In addition, the framework provides the following key management services: + +- Push model: Event/Alarm information to remote syslog hosts and subscribed gNMI clients +- Pull model: Event/Alarm information from CLI, REST/gNMI interfaces +- Ability to change severity of events, turn off a particular event +- Ability to acknowledge an alarm + +## 2.2 Functional Description +Event Management Framework allows applications to store "state" of the system for user to query through various north bound interfaces. + +# 3 Design +## 3.1 Overview +There are three players in the event framework. Producers, which raises events; a consumer to receive and process them as they are raised and a set of receivers one for each NBI type. + +Applications act as producers of events. + +Event consumer class in eventd container receives and processes the received event. +Event consumer manages received events, updates event table, alarm table, event_stats table and alarm_stats tables and invokes logging API, which constructs message and sends it over to syslog. + +Operator can chose to change properties of events with the help of event profile. Default +event profile is available at */etc/evprofile/default.json*. User can download the default event profile, +modify and upload it back to the switch to apply it. + +Through event profile, user can change severity of any event and also can enable/disable a event. + +Through CLI, REST or gNMI, event table and alarm table can be retrieved using various filters. + +### 3.1.1 Event Producers +Application that need to raise an event, need to use event notifiy API ( LOG_EVENT ). +This API is part of *libeventnotify* library that applications need to link. + +For one-shot events, applications need to provide event-id (name of the event), source, dynamic message, and event action set to NOTIFY. + +For alarms, applications need to provide event-id (name of the event), source, dynamic message, and event action (RAISE_ALARM / CLEAR_ALARM / ACK_ALARM /UNACK_ALARM). +The ACK_ALARM/UNACK_ALARM action types are used only by mgmt-framework to provide the functionality to acknowledge/unacknowledge the alarms through NBI. + +Eventd maintains a json file of events and alarms at sonic-eventd/etc/evprofile/default.json. This is the default event profile that gets installed on the device at /etc/evprofile/default.json. +Developers of new events or alarms need to update this file by declaring name and other characteristics - severity, enable flag and static message that gets appended with dynamic message. + +``` +{ + "__README__" : "This is default map of events that eventd uses. Developer can modify this file and send + SIGINT to eventd to make it read and use the updated file. Alternatively developer can test + the new event by adding it to a custom event profile and use 'event profile ' command + to apply that profile without sending SIGINT to eventd. Developer need to commit default.json file + with the new event after testing it out. + Supported severities are: CRITICAL, MAJOR, MINOR, WARNING and INFORMATIONAL. + Supported enable flag values are: true and false.", + "events":[ + { + "name" : "CUSTOM_EVPROFILE_CHANGE", + "severity" : "INFORMATIONAL", + "enable" : "true", + "message" : "Custom Event Profile is applied." + }, + { + "name": "TEMPERATURE_EXCEEDED", + "severity": "CRITICAL", + "enable": "true" + "message" : "Temperature threshold is 75 degrees." + } + ] +} +``` +The format of event notify API is: + +definition: +``` + LOG_EVENT(name, source, action, MSG, ...) +``` +- name is name of the event +- source is the object that is generating this event +- action is either NOTIFY, RAISE_ALARM, CLEAR_ALARM, ACK_ALARM or UNACK_ALARM + +Usage: +For one-shot events: +``` + LOG_EVENT(CUSTOM_EVPROFILE_CHANGE, profile_name.c_str(), NOTIFY, "New event profile is %s", profile_name.c_str()); +``` + +For alarms: +``` + if (temperature >= THRESHOLD) { + LOG_EVENT(TEMPERATURE_EXCEEDED, sensor_name_p, RAISE_ALARM, "Temperature for sensor %s is %d degrees", sensor_name_p, current_temp); + } else { + LOG_EVENT(TEMPERATURE_EXCEEDED, sensor_name_p, CLEAR_ALARM, "Temperature for the sensor %s is %d degrees ", sensor_name_p, current_temp); + } +``` +#### 3.1.1.2 Development Process + +Here is a typical developement process to link eventnotify library to a component and be able to send new events/alarms: + +a. Update buildimage/rules/*app*.mk + + Add $(LIBEVENTNOTIFY_DEV) to compile dependency. + + Add $(LIBEVENTNOTIFY) to runtime dependency. + +``` + Ex: For rules/tam.mk, + + $(SONIC_TAM)_DEPENDS += $(LIBEVENTNOTIFY_DEV) + $(SONIC_TAM)_RDEPENDS += $(LIBEVENTNOTIFY) +``` + +b. Update Makefile.am of the app to link to event notify library. +``` + Ex: To let tammgr use event notify API, update src/sonic-tam/tammgr/Makefile.am as below: + + tammgrd_LDADD += -leventnotify +``` +c. Declare the name of new event/alarm along with severity, enable flag and static message in sonic-eventd/etc/evprofile/default.json + +d. In the source file where event is to be raised, include eventnotify.h and invoke LOG_EVENT with action as NOTIFY/RAISE_ALARM/CLEAR_ALARM (ACK_ALARM/UNACK_ALARM are used by mgmt-framework to allow users to acknowledge/unacknowledge alarms). + +The event notifier takes the event properties, packs a field value tuple and writes to a table, by name, EVENTPUBSUB. + +The EVENTPUBSUB table uses event-id and a sequence-id generated locally by event notifier as the key so that there wont be any conflicts across multiple applications trying to write to this table. + +### 3.1.2 Event Consumer +The event consumer is a class in sonic-eventd container that processes the incoming record. + +On intitialization, event consumer reads */etc/evprofile/default.json* and builds an internal map of events, called *static_event_map*. +It then verifies if there was a custom event profile configured and merges its contents to static_event_map built from default event profile. +It then reads from EVENTPUBSUB table. This table contains records that are published by applications and waiting to be read by eventd. +Whenever there is a new record, event consumer reads the record, processes and deletes it. + +On reading the field value tuple, using the event-id in the record, event consumer fetches static information from *static_event_map*. +As mentioned above, static information contains severity, static message and event enable flag. +If the enable flag is set to false, event consumer ignores the event by logging a debug message. +If the flag is set to true, it continues to process the event as follows: +- Generate new sequence-id for the event +- Write the event to Event Table +- It verifies if the event corresponds to an alarm - by checking the *action* field. If so, alarm consumer API is invoked for the event for further processing. + - If action is RAISE_ALARM, add the record to ALARM table + - If action is CLEAR_ALARM, remove the entry from ALARM table + - If action is ACK_ALARM, update *acknowledged* flag of the corresponding raised entry to true in ALARM table and stores timestamp to *acknowledge_time*. + - If action is UNACK_ALARM, update *acknowledged* flag of the corresponding raised entry to false in ALARM table and stores timestamp to *acknowledge_time*. + - Event and Alarm Statistics tables are updated +- Invoke logging API to send a formatted message to syslog + +#### 3.1.2.1 Severity +Supported event severities: CRITICAL, MAJOR, MINOR, WARNING and INFORMATIONAL as defined opeconfig alarm yang. +The corresponding syslog severities are: log-alert, log-crit, log-error, log-warning and log-notice respectively. +Severity INFORMATIONAL is not applicable to alarms. + +#### 3.1.2.2 Sequence-ID +Every new event should have a unique sequential ID. The sequence-id is persistent and continues to grow until 2 exp 64. + +### 3.1.3 Alarm Consumer +The alarm consume method on receiving the event record, verifies the event action. If it is RAISE_ALARM, it adds the record to Alarm Table. +The counter in ALARM_STATS corresponding to the severity of the incoming alarm is increased by 1. + +Eventd maintains a lookup map of *sequence-id* and pair of *event-id* and *resource* fields. +An entry for the newly received event is added to this look up map. + +- If the action is CLEAR_ALARM, it removes the previous record of the raised alarm using above lookup map. + The counter in ALARM_STATS corresponding to the severity of the updated alarm is reduced by 1. + +- If the action is ACK_ALARM, alarm consumer finds the raised record of the alarm in the ALARM table using the above lookup map and updates *acknowledged* flag to true. The *acknowledge-time* is updated with the timestamp of ack event. + ALARM_STATS is updated by reducing the corresponding severity counter by 1. + +- If the action is UNACK_ALARM, alarm consumer finds the raised record of the alarm in the ALARM table using the above lookup map and updates *acknowledged* flag to false. The *acknowledge-time* is updated with the timestamp of unack event. + ALARM_STATS is updated by increasing the corresponding severity counter by 1. + +pmon can use ALARM_STATS to update system LED based on severities of outstanding alarms: +``` + Red if any outstanding critical/major alarms, else Yellow if any minor/warning alarms, else Green. +``` +An outstanding alarm is an alarm that is either not cleared or not acknowledged by the user yet. + +The following illustrates how ALARM table is updated as alarms goes through their life cycle and how can an application use it. +Example here is pmon using ALARM_STATS table to control system LED. + +| alarm | severity | acknowledged | +|:-----:|:----------:|:-------------:| +| | | | +| | | | + +Alarm table is empty. All counters in ALARM_STATS is 0. System LED is Green. + +| alarm | severity | acknowledged | +|:-----:|:----------:|:------------:| +| ALM-1 | CRITICAL | | +| ALM-2 | MINOR | | + +Alarm table now has two alarms. One with *CRITICAL* and other with *MINOR*. ALARM_STATS is updated as: Critical as 1 and Minor as 1. As There is atleast one alarm with *critical/major* severity, system LED is Red. + +| alarm | severity | acknowledged | +|:-----:|:----------:|:------------:| +| ALM-2 | MINOR | | + +The *CRITICAL* alarm is cleared by the application, so alarm consumer removes it from ALARM table, ALARM_STATS is updated as: Critical as 0 and Minor as 1. As there is at least one *minor/warning* alarms in the table, system LED is Amber. + +| alarm | severity | acknowledged | +|:-----:|:----------:|:------------:| +| ALM-2 | MINOR | | +| ALM-9 | MAJOR | | + +Now there is an alarm with *MAJOR* severity. ALARM_STATS now reads as: Major as 1 and Minor as 1. So, system LED is Red. + +| alarm | severity | acknowledged | +|:-----:|:----------:|:------------:| +| ALM-2 | MINOR | | +| ALM-9 | MAJOR | true | + +The *MAJOR* alarm is acknowledged by user, alarm consumer sets *acknolwedged* flag to true and reduces Major counter in ALARM_STATS by 1, ALARM_STATS now reads as: Major 0 and Minor 1. This way, acknowledged major alarm has no effect on system LED. There are no other *CRITICAL/MAJOR* alarms. There however, exists an alarm with *MINOR/WARNING* severity. System LED is Amber. + +| alarm | severity | acknowledged | +|:-----:|:----------:|:------------:| +| ALM-2 | MINOR | true | +| ALM-9 | MAJOR | true | + +The *MINOR* alarm is also acknowledged by user. ALARM_STATS reads: Major as 0, Minor as 0. So it is also taken out of consideration for system LED. System LED is Green. + +| alarm | severity | acknowledged | +|:-----:|:----------:|:------------:| +| ALM-2 | MINOR | true | +| ALM-9 | MAJOR | false | + +The *MAJOR* alarm is also unacknowledged by user. ALARM_STATS reads: Major as 1, Minor as 0. So it is now considered for system LED. System LED becomes Red. + +### 3.1.4 Event Receivers +Supported NBIs are: syslog, REST and gNMI. + +#### 3.1.4.1 syslog +Logging API contains logic to take the event record, augment it with any static information, format the message and +send it to syslog. +``` + if (ev_act.empty()) { + const char LOG_FORMAT[] = "[%s], %%%s %s. %s"; + // event Type + // Event Name + // Static Desc + // Dynamic Desc + + // raise a syslog message + syslog(LOG_MAKEPRI(ev_sev, SYSLOG_FACILITY), LOG_FORMAT, + ev_type.c_str(), + ev_id.c_str(), ev_msg.c_str(), ev_static_msg.c_str()); + } else { + const char LOG_FORMAT[] = "[%s] (%s), %%%s %s. %s"; + // event Type + // event action + // Event Name + // Static Desc + // Dynamic Desc + // raise a syslog message + syslog(LOG_MAKEPRI(ev_sev, SYSLOG_FACILITY), LOG_FORMAT, + ev_type.c_str(), ev_act.c_str(), + ev_id.c_str(), ev_msg.c_str(), ev_static_msg.c_str()); + } +``` +An example of syslog message generated for an event raised when user selects a custom event profile. +``` +May 19 21:22:07.122786 2021 sonic WARNING eventd#eventd[2419]: [EVENT], %CUSTOM_EVPROFILE_CHANGE : handle_custom_evprofile: Custom Event Profile myprofile.json is applied.. Custom Event Profile is selected by user. +``` +Syslog message for an alarm raised by a sensor: +``` +May 19 21:42:14.373410 2021 sonic ALERT eventd#eventd[2453]: [ALARM] (RAISE), %TEMPERATURE_EXCEEDED : temperatureCrossedThreshold: Current temperature of sensor/2 is 76 degrees. Temperature threshold is 75 degrees. +``` +Syslog message when alarm is clared is as follows: +``` +May 19 21:46:34.373693 2021 sonic ALERT eventd#eventd[2453]: [ALARM] (CLEAR), %TEMPERATURE_EXCEEDED : temperatureCrossedThreshold: Current temperature of sensor/2 is 70 degrees. Temperature threshold is 75 degrees. +``` +Syslog message when alarm with id=4 is acknowledged is as follows: +``` +May 19 21:48:05.870530 2021 sonic ALERT eventd#eventd[2453]: [ALARM] (ACKNOWLEDGE), Alarm id 4 ACKNOWLEDGE. +``` + +Syslog message when alarm with id=4 is unacknowledged is as follows: +``` +May 19 21:53:24.490545 2021 sonic ALERT eventd#eventd[2453]: [ALARM] (UNACKNOWLEDGE), Alarm id 4 UNACKNOWLEDGE. +``` +Operator can configure specifc syslog host to receive either syslog messages corresponding to events or general log messages. +Through CLI, operator can chose 'logging server [log|event]' command. +When operator configures a host with 'event' type, it receives *only* log messages corresponding to events. +Support for VRF/source-interface/UDP port are all are applicable for 'event' type. + +#### 3.1.4.2 REST +Subcribing through REST to receive event notifications is currently being evaluated. + +#### 3.1.4.3 gNMI +gNMI clients can subscribe to receive event notifications. Subscribed gNMI clients receive event fields as in the DB and +there is no customization of these fileds similar to syslog messages. + +TODO: add definitions of protobuf spec + +#### 3.1.4.4 System LED +The original requirement was to change LED based on severities of the events. But on most of the platforms the system/power/fan LEDs are managed by the BMC. +BMC (baseboard management controller) is an embedded system that manages various platform elements like fan, PSU, temperature sensors. +There is an API that can be invoked to control LED, but not all platforms will support that API if they are fully controlled by the BMC. +So, on certain platforms, system LED could not represent events on the system. + +Another issue is: Currently pmon controls LED, and as eventd now tries to change the very same LED, which leads to conflicts. +A mechanism must exist for one of these to be master, which, in this case, is pmon. + +The proposed solution is to have pmon use ALAMR_STATS counters in conjunction with existing logic to update system LED. + +#### 3.1.4.5 Event/Alarm flooding +There are scenarios when system enters a loop of a fault condition that makes application trigger events continuously. To avoid such +instances flood the EVENT or ALARM tables, eventd maintains a cache of last event/alarm. Every new event/alarm is compared against this cache entry +to make sure it is not a flood. If it is found to be same event/alarm, the newly raised entry will be silently discarded. + +#### 3.1.4.6 Eventd continuous restart +Under the scenarios when eventd runs into an issue and restarts continuously, applications might keep writing to the eventpubsub table. As consumer - eventd - is not able to remove events from the pusbsub table, eventpusbub table could grow forever as applications keep rising events/alarms. +One way to fix is to have the system monitor daemon to periodically (very high polling interval) to check the number of keys in the table and if it exceeds a number, delete all the entries. When system monitor daemon does this, it logs a syslog message. + +### 3.1.5 Event Profile +The Event profile contains mapping between event-id and severity of the event, enable flag. +Through event profile, operator can change severity of a particular event. And can also enable/disable +a particular event. + +The default profile exists at */etc/evprofile/default.json* +By default, every event is enabled. +The severity of event is decided by developer while adding the event. +``` +{ + "__README__" : "This is default map of events that eventd uses. Developer can modify this file and send + SIGINT to eventd to make it read and use the updated file. Alternatively developer can test + the new event by adding it to a custom event profile and use 'event profile ' command + to apply that profile without sending SIGINT to eventd. Developer need to commit default.json file + with the new event after testing it out. + Supported severities are: CRITICAL, MAJOR, MINOR, WARNING and INFORMATIONAL. + Supported enable flag values are: true and false.", + "events":[ + { + "name" : "CUSTOM_EVPROFILE_CHANGE", + "severity" : "INFORMATIONAL", + "enable" : "true", + "message" : "Custom Event Profile is applied." + }, + { + "name": "TEMPERATURE_EXCEEDED", + "severity": "CRITICAL", + "enable": "true" + "message" : "Temperature threshold is 75 degrees." + } + ] +} +``` +User can download the default event profile to a remote host. User can modify characteristics of +some/all events in the profile and can upload it back to the switch and place the file at /etc/evprofile/. + +The uploaded profile will be called custom event profile. + +An example of custom event profile is as below. +With this particular custom event profile, user wants to +- change severity of CUSTOM_EVPROFILE_CHANGE event (severity changed from INFORMATIONAL to MAJOR) +- suppress the TEMPERATURE_EXCEEDED alarm (enable flag is changed from true to false) +- introduce new alarm by name DUMMY_ALARM (there should be an application to raise/clear this new alarm). +``` +{ + "events": [ + { + "name" : "CUSTOM_EVPROFILE_CHANGE", + "severity" : "MAJOR", + "enable" : "true", + }, + { + "name": "TEMPERATURE_EXCEEDED", + "severity": "CRITICAL", + "enable": "false" + }, + { + "name" : "DUMMY_ALARM", + "severity" : "WARNING", + "enable" : "true", + } + ] +} +``` + +User can have multiple custom profiles and can select any of the profiles under /etc/evprofile/ using 'event profile' command. + +The framework will sanity check the user selected profile and merges it map of events *static_event_map* maintained by eventd. + +After a successful sanity check, the framework generates an event indicating that a new profile is in effect. + +If there are any outstanding alarms in the alarm table, the framework removes those records for which enable is set to false in the new profile. +Severity counters in ALARM_STATS are reduced accordingly. + +Eventd starts using the merged map of characteristics for the all the newly generated events. A CUSTOM_EVPROFILE_CHANGE event is generated. + +The event profile is upgrade and downgrade compatible by accepting only those attributes that are *known* to eventd. +All the other attributes will remain to their default values. + +Sanity check rejects the profile if attributes contains values that are not known to eventd. + +Config Migration hooks will be used to persist custom profiles across an upgrade. + +The profile can also be applied through ztp. + +### 3.1.6 CLI +The show CLI require many filters with range specifiers. +Various filters are supported using RPC. + +e.g. +``` +rpc getEventBySeqeuenceId{ +input { + from sequence-id; + to sequence-id; + } +output { + list event-table-entries; +} +``` + +The rpc callback needs to access DB with the given set of sequence ids. + +The gNMI server (gnoi_client.go, gnoi.go, sonic_proto, transl_utils.go) need to be extended to support the RPC to support similar operations for gNMI. + +### 3.1.7 Event Table and Alarm Table +The Event Table (EVENT) and Alarm List Table (ALARM) stored in EVENT_DB. +The size of Event Table is 40k records or 30 days worth of events which ever hits earlier. +A manifest file will be created with parameters to specify the number and number of days limits for +eventd to read and enforce them. + +``` +root@sonic:/etc# cat eventd.json +{ + "config" : { + "no-of-records": 40000, + "no-of-days": 30 + } +} +``` +'no-of-records' indicates maximum number of records EVENT table can hold. The range is 1-40000. +'no-of-days' indicates maximum number of days an event can exist in the EVENT table. The range is 1-30. + +When either of the limit is reached, the framework wraps around the table by discarding older records. + +User can send SIGINT to eventd process to force read and apply the manifest limits. + +An example of an event in EVENT table. +``` +EVENT Table: +============================== + +Key : id + +id : Unique sequential ID generated by the system for every event {uint64} +type-id : Name of the event generated {string} +text : Dynamic message describing the cause for the event {string} +time-created : Time stamp at which the event is generated {uint64} +action : Indicates action of the event; for one-shot events, it is empty. For alarms it could be raise, clear or acknowledge {enum} +resource : Object which generated the event {string} +severity : Severity of the event {string} + +127.0.0.1:6379[6]> hgetall "EVENT|1" + 1) "text" + 2) "handle_custom_evprofile: Custom Event Profile x.json is applied." + 3) "type-id" + 4) "CUSTOM_EVPROFILE_CHANGE" + 5) "id" + 6) "1" + 7) "time-created" + 8) "1621459327118629520" + 9) "resource" +10) "/etc/evprofile/x.json" +11) "severity" +12) "WARNING" +127.0.0.1:6379[6]> +``` + +Schema for EVENT_STATS table is as follows: +``` +EVENT_STATS Table: +============================== + +Key : id + +id : key {state} +events : Total events raised {uint64} +raised : Total alarms raised {uint64} +cleared : Total alarms cleared {uint64} +acked : Total alarms acknowledged {uint64} + +127.0.0.1:6379[6]> hgetall "EVENT_STATS|state" +1) "events" +2) "1" +3) "raised" +4) "0" +5) "cleared" +6) "0" +7) "acked" +8) "0" +127.0.0.1:6379[6]> +``` +Alarm Table will not have any limits as it only contains the snapshot of the alarms during the current run. + +Contents of an alarm record. In this case, the alarm was raised temperature crossed a threshold. +``` +ALARM Table: +============================== + +Key : id + +id : Unique sequential ID generated by the system for every event {uint64} +type-id : Name of the event generated {string} +text : Dynamic message describing the cause for the event {string} +time-created : Time stamp at which the event is generated {uint64} +acknowledged : Indicates if alarm has been acknowledged {boolean} +resource : Object which generated the event {string} +severity : Severity of the event {string} +acknowledged : Indicates when alarm has been acknowledged/unacknowledged {uint64} + +127.0.0.1:6379[6]> hgetall "ALARM|2" + 1) "type-id" + 2) "TEMPERATURE_EXCEEDED" + 3) "text" + 4) "temperatureCrossedThreshold: Current temperature for sensor/2 is 76 degrees" + 5) "action" + 6) "RAISE" + 7) "resource" + 8) "sensor/2" + 9) "time-created" +10) "1621460371062299951" +11) "severity" +12) "CRITICAL" +13) "id" +14) "2" +15) "acknowledged" +16) "false" +127.0.0.1:6379[6] +``` + +Schema for ALARM_STATS table is as below. When an alarm of particular severity is cleared, +the corresponding severity counter is decremented. +``` +ALARM_STATS Table: +============================== + +Key : id + +id : key {state} +alarms : Number of active alarms {uint64} +critical : Number of alarms of severity 'critical' {uint64} +major : Number of alarms of severity 'major' {uint64} +minor : Number of alarms of severity 'minor' {uint64} +warning : Number of alarms of severity 'warning' {uint64} +informational : Number of alarms of severity 'informational' {uint64} + +127.0.0.1:6379[6]> hgetall "ALARM_STATS|state" + 1) "alarms" + 2) "1" + 3) "critical" + 4) "1" + 5) "major" + 6) "0" + 7) "minor" + 8) "0" + 9) "warning" +10) "0" + +``` +### 3.1.8 Pull Model +All NBIs - CLI, REST and gNMI - can pull contents of alarm table and event table. +The following filters are supported: +- ALL ( pulls all alarms) +- Severity. +- Recent alarms (eg., last 5 minutes, one hour, one day). +- Records between two timestamps, one timestamp and end, and beginning and a timestamp. +- All records between two Sequence Numbers (incl end and begin) + +### 3.1.9 Supporting third party containers +To support third party components ( e.g. FRR, teamd, DHCP Relay, LLDPd, ntpd etc ) which can not be modified to raise events, the following options are considered +and are being evaluated. +1. Patch the components + Create a patch for these components by adding libeventnotify library and invoke the API. This however, requires these patches need to be maintained in the code forever. + +2. Listen to syslog messages + As many of these components raises syslog messages on an important event, a listener can be implemented to read incoming syslog messages and raise + events based on the message. + This however is heavy on performance due to the fact that listener has to parse each syslog message. Also listener need to maintain a map of messages to + event-id and need to be aware of resource and other specific details. It need to be aware of nuances of alarm raising/clearing if the component follows + any specific logic. + +Approach 1 is preferred. + +## 3.2 DB Changes +### 3.2.1 EVENT DB +A new instance, redis4, is created and EVENT DB uses the new instance. +The following tables uses Event DB. +Table EVENTPUBSUB is used for applications to write events and for eventd to access and process them. +Event Table (EVENT) and Alarm Table (ALARM) are used to house events and alarms respectively. +To maintain various statistics of events, these two tables are used : EVENT_STATS and ALARM_STATS. + +EVPROFILE table is used by mgmt-framework to communicate name of the custom event profile when configured through NBI. +Eventd reads the file name from this table and merges it with its static_event_map. + +## 3.3 User Interface +### 3.3.1 Data Models + +The following is SONiC yang for events. +``` +module: sonic-event + +--rw sonic-event + +--rw EVENT + | +--rw EVENT_LIST* [id] + | +--rw id uint64 + | +--rw resource? string + | +--rw text? string + | +--rw time-created? timeticks64 + | +--rw type-id? string + | +--rw severity? severity-type + | +--rw action? action-type + +--rw EVENT_STATS + +--rw EVENT_STATS_LIST* [id] + +--rw id enumeration + +--rw events? uint64 + +--rw raised? uint64 + +--rw acked? uint64 + +--rw cleared? uint64 + + rpcs: + +---x show-events + +---w input + | +---w (option)? + | +--:(time) + | | +---w time + | | +---w begin? yang-types:date-and-time + | | +---w end? yang-types:date-and-time + | +--:(last-interval) + | | +---w interval? enumeration + | +--:(severity) + | | +---w severity? severity-type + | +--:(id) + | +---w id + | +---w begin? string + | +---w end? string + +--ro output + +--ro status? int32 + +--ro status-detail? string + +--ro EVENT + +--ro EVENT_LIST* [id] + +--ro id uint64 + +--ro resource? string + +--ro text? string + +--ro time-created? timeticks64 + +--ro type-id? string + +--ro severity? severity-type + +--ro action? action-type +``` + +The following is SONiC yang for alarms. +``` +module: sonic-alarm + +--rw sonic-alarm + +--rw ALARM + | +--rw ALARM_LIST* [id] + | +--rw id uint64 + | +--rw resource? string + | +--rw text? string + | +--rw time-created? event:timeticks64 + | +--rw type-id? string + | +--rw severity? event:severity-type + | +--rw acknowledged? boolean + | +--rw acknowledge-time? event:timeticks64 + +--rw ALARM_STATS + +--rw ALARM_STATS_LIST* [id] + +--rw id enumeration + +--rw alarms? uint64 + +--rw critical? uint64 + +--rw major? uint64 + +--rw minor? uint64 + +--rw warning? uint64 + +--rw acknowledged? uint64 + + rpcs: + +---x acknowledge-alarms + | +---w input + | | +---w id* string + | +--ro output + | +--ro status? int32 + | +--ro status-detail? string + +---x unacknowledge-alarms + | +---w input + | | +---w id* string + | +--ro output + | +--ro status? int32 + | +--ro status-detail? string + +---x show-alarms + +---w input + | +---w (option)? + | +--:(time) + | | +---w time + | | +---w begin? yang-types:date-and-time + | | +---w end? yang-types:date-and-time + | +--:(last-interval) + | | +---w interval? enumeration + | +--:(severity) + | | +---w severity? event:severity-type + | +--:(id) + | +---w id + | +---w begin? string + | +---w end? string + +--ro output + +--ro status? int32 + +--ro status-detail? string + +--ro ALARM + +--ro ALARM_LIST* [id] + +--ro id uint64 + +--ro resource? string + +--ro text? string + +--ro time-created? event:timeticks64 + +--ro type-id? string + +--ro severity? event:severity-type + +--ro acknowledged? boolean + +--ro acknowledge-time? event:timeticks64 +``` + +Following is for sonic yang to support event profiles. +``` +module: sonic-evprofile + + rpcs: + +---x get-evprofile + | +--ro output + | +--ro file-name? string + | +--ro file-list* string + +---x set-evprofile + +---w input + | +---w file-name? string + +--ro output + +--ro status? string +``` + +openconfig alarms yang is defined at [here](https://github.com/openconfig/public/blob/master/release/models/system/openconfig-alarms.yang) + +### 3.3.2 CLI +#### 3.3.2.1 Exec Commands +``` +sonic# alarm acknowledge +``` +An operator can acknolwedge a raised alarm. This indicates that the operator is aware of the fault condition and considers the condition not catastrophic. +Acknowledging an alarm updates alarm statistics and thereby applications like pmon can remove the particular alarm from status consideration. + +The alarm record in the ALARM table is marked with acknowledged field set to true. There is acknowledge-time field that indicates when that alarm is acknowledged. + +``` +sonic# alarm unacknowledge +``` +An operator can un-acknolwedge a previously acknowledged raised alarm. +Un-acknowledging an alarm updates alarm statistics and thereby applications like pmon can take the particular alarm into status consideration. + +The alarm record in the ALARM table is marked with acknowledged field set to false. +There is acknowledge-time field that indicates when that alarm is un-acknowledged. + +``` +sonic# event profile +``` +The command takes name of specified file, validates it for its syntax and values; merges it with its internal static map of events *static_event_map*. + +``` +sonic# clear event +``` +This command clears all the records in the event table. All the event stats are cleared. +The command will not affect alarm table or alarm statistics. +Eventd generates an event informing that event table is cleared. + +#### 3.3.2.2 Configuration Commands +``` +sonic(config)# logging server [log|event] +``` +Note: The 'logging server' command is an existing, already supported command. +It is only enhanced to take either 'log' or 'event' to indicate either native syslog messages or syslog messages corresponding to events alone are sent to the remote host. +Support with VRF/source-interface and configuring remote-port are all backward comaptible and will be applicable to either 'log' or 'event' options. + +#### 3.3.2.3 Show Commands +``` +sonic# show event profile +-------------------------- +Active Event Profile +-------------------------- +myProfile.json +-------------------------- +Available Event Profiles +-------------------------- +default.json +myProfile.json +userProfile.json + +sonic# show event [ details | summary | severity | start end | recent <5min|60min|24hr> | id | from to ] + +'show event' commands would display all the records in EVENT table. + +sonic# show event +---------------------------------------------------------------------------------------------------------------------------- +Id Action Severity Name Timestamp Description +---------------------------------------------------------------------------------------------------------------------------- +1 - WARNING CUSTOM_EVPROFILE_CHANGE 2021-05-19T21:38:27.455Z handle_custom_evprofile: Custom Event Profile x.json is applied. +2 RAISE CRITICAL DUMMY_ALARM 2021-05-19T21:39:31.622Z signalHandler: Raising simulated alarm +3 CLEAR CRITICAL DUMMY_ALARM 2021-05-19T21:42:34.371Z signalHandler: Clearing simulated alarm +4 RAISE CRITICAL DUMMY_ALARM 2021-05-19T21:46:14.371Z signalHandler: Raising simulated alarm +5 ACKNOWLEDGE CRITICAL DUMMY_ALARM 2021-05-19T21:48:05.845Z Alarm id 4 ACKNOWLEDGE. +6 UNACKNOWLEDGE CRITICAL DUMMY_ALARM 2021-05-19T21:53:24.484Z Alarm id 4 UNACKNOWLEDGE. +7 CLEAR CRITICAL DUMMY_ALARM 2021-05-19T21:55:54.977Z signalHandler: Clearing simulated alarm + +sonic# show event details +---------------------------------------------- +Event Details - 1 +---------------------------------------------- +Id: 1 +Action: - +Severity: WARNING +Type: CUSTOM_EVPROFILE_CHANGE +Timestamp 2021-05-19T21:38:27.455Z +Description: handle_custom_evprofile: Custom Event Profile x.json is applied. +Source: /etc/evprofile/x.json + +---------------------------------------------- +Event Details - 2 +---------------------------------------------- +Id: 2 +Action: RAISE +Severity: CRITICAL +Type: DUMMY_ALARM +Timestamp 2021-05-19T21:39:31.622Z +Description: signalHandler: Raising simulated alarm +Source: simulation + +---------------------------------------------- +Event Details - 3 +---------------------------------------------- +Id: 3 +Action: CLEAR +Severity: CRITICAL +Type: DUMMY_ALARM +Timestamp 2021-05-19T21:42:34.371Z +Description: signalHandler: Clearing simulated alarm +Source: simulation + +sonic# show event summary +Event summary +--------------------------------- +Total: 14 +Raised: 4 +Acknowledged: 1 +Cleared: 3 +---------------------------------- + +sonic# show event severity critical +---------------------------------------------------------------------------------------------------------------------------- +Id Action Severity Name Timestamp Description +---------------------------------------------------------------------------------------------------------------------------- +2 RAISE CRITICAL DUMMY_ALARM 2021-05-19T21:39:31.622Z signalHandler: Raising simulated alarm +3 CLEAR CRITICAL DUMMY_ALARM 2021-05-19T21:42:34.371Z signalHandler: Clearing simulated alarm +4 RAISE CRITICAL DUMMY_ALARM 2021-05-19T21:46:14.371Z signalHandler: Raising simulated alarm +5 ACKNOWLEDGE CRITICAL DUMMY_ALARM 2021-05-19T21:48:05.845Z Alarm id 4 ACKNOWLEDGE. +6 UNACKNOWLEDGE CRITICAL DUMMY_ALARM 2021-05-19T21:53:24.484Z Alarm id 4 UNACKNOWLEDGE. +7 CLEAR CRITICAL DUMMY_ALARM 2021-05-19T21:55:54.977Z signalHandler: Clearing simulated alarm + +sonic# show event recent 24hr +---------------------------------------------------------------------------------------------------------------------------- +Id Action Severity Name Timestamp Description +---------------------------------------------------------------------------------------------------------------------------- +2 RAISE CRITICAL DUMMY_ALARM 2021-05-19T21:39:31.622Z signalHandler: Raising simulated alarm +3 CLEAR CRITICAL DUMMY_ALARM 2021-05-19T21:42:34.371Z signalHandler: Clearing simulated alarm +4 RAISE CRITICAL DUMMY_ALARM 2021-05-19T21:46:14.371Z signalHandler: Raising simulated alarm +5 ACKNOWLEDGE CRITICAL DUMMY_ALARM 2021-05-19T21:48:05.845Z Alarm id 4 ACKNOWLEDGE. +6 UNACKNOWLEDGE CRITICAL DUMMY_ALARM 2021-05-19T21:53:24.484Z Alarm id 4 UNACKNOWLEDGE. +7 CLEAR CRITICAL DUMMY_ALARM 2021-05-19T21:55:54.977Z signalHandler: Clearing simulated alarm + +sonic# show event id 2 +---------------------------------------------- +Event Details - 2 +---------------------------------------------- +Id: 2 +Action: RAISE +Severity: CRITICAL +Type: DUMMY_ALARM +Timestamp 2021-05-19T21:39:31.622Z +Description: signalHandler: Raising simulated alarm +Source: simulation + +sonic# show event from 2 to 5 +---------------------------------------------------------------------------------------------------------------------------- +Id Action Severity Name Timestamp Description +---------------------------------------------------------------------------------------------------------------------------- +2 RAISE CRITICAL DUMMY_ALARM 2021-05-19T21:39:31.622Z signalHandler: Raising simulated alarm +3 CLEAR CRITICAL DUMMY_ALARM 2021-05-19T21:42:34.371Z signalHandler: Clearing simulated alarm +4 RAISE CRITICAL DUMMY_ALARM 2021-05-19T21:46:14.371Z signalHandler: Raising simulated alarm +5 ACKNOWLEDGE CRITICAL DUMMY_ALARM 2021-05-19T21:48:05.845Z Alarm id 4 ACKNOWLEDGE. + +sonic# show event start 2021-05-19T21:39:31.622Z end 2021-05-19T21:46:14.371Z +---------------------------------------------------------------------------------------------------------------------------- +Id Action Severity Name Timestamp Description +---------------------------------------------------------------------------------------------------------------------------- +3 CLEAR CRITICAL DUMMY_ALARM 2021-05-19T21:42:34.371Z signalHandler: Clearing simulated alarm + +sonic# show alarm [ acknowledged | all | detail | summary | severity | id | start end | recent <5min|1hr|1day> | from to ] + +'show alarm' command would display all the *active* alarm records in ALARM table. Acknowledged alarms wont be shown here. + +sonic# show alarm +---------------------------------------------------------------------------------------------------------------------------- +Id Severity Name Timestamp Description +---------------------------------------------------------------------------------------------------------------------------- +14 WARNING TEMPERATURE_EXCEEDED 2021-05-20T00:47:52.992Z temperatureCrossedThreshold: Current temperature of sensor/2 is 76 degrees +16 WARNING PSU_FAULT 2021-05-20T02:16:42.611Z :- /psu/2 has experienced a fault + +sonic# show alarm all +---------------------------------------------------------------------------------------------------------------------------- +Id Severity Name Timestamp Description +---------------------------------------------------------------------------------------------------------------------------- +14 WARNING TEMPERATURE_EXCEEDED 2021-05-20T00:47:52.992Z temperatureCrossedThreshold: Current temperature of sensor/2 is 76 degrees +15 WARNING DUMMY_ALARM 2021-05-20T02:16:41.637Z signalHandler: Raising simulated alarm +16 WARNING PSU_FAULT 2021-05-20T02:16:42.611Z /psu/2 has experienced a fault + + +sonic# show alarm detail + +alarm details - 14 +------------------------------------------- +Id: 14 +Severity: CRITICAL +Source: /sensor/2 +Name: TEMPERATURE_EXCEEDED +Description: temperatureCrossedThreshold: Current temperature of sensor/2 is 76 degrees +Raise-time: Wed Feb 10 18:08:24 2021 +Ack-time: +New: true +Acknowledged: false + +sonic# show alarm from 14 to 16 +---------------------------------------------------------------------------------------------------------------------------- +Id Severity Name Timestamp Description +---------------------------------------------------------------------------------------------------------------------------- +14 WARNING TEMPERATURE_EXCEEDED 2021-05-20T00:47:52.992Z temperatureCrossedThreshold: Current temperature of sensor/2 is 76 degrees +15 WARNING DUMMY_ALARM 2021-05-20T02:16:41.637Z signalHandler: Raising simulated alarm +16 WARNING PSU_FAULT 2021-05-20T02:16:42.611Z /psu/2 has experienced a fault + +sonic# show alarm summary +Alarm summary +--------------------------------- +Total: 3 +Critical: 0 +Major: 0 +Minor: 0 +Warning: 3 +Acnowledged: 2 +---------------------------------- +``` + +### 3.3.3 REST API Support + +sonic REST links: +* /restconf/data/sonic-event:sonic-event/EVENT/EVENT_LIST +* /restconf/data/sonic-event:sonic-event/EVENT_STATS/EVENT_STATS_LIST +* /restconf/data/sonic-alarm:sonic-alarm/ALARM/ALARM_LIST +* /restconf/data/sonic-alarm:sonic-alarm/ALARM_STATS/ALARM_STATS_LIST +* /restconf/operations/sonic-evprofile:get-evprofile +* /restconf/operations/sonic-evprofile:set-evprofile +* /restconf/operations/sonic-alarm:acknowledge-alarms +* /restconf/operations/sonic-alarm:unacknowledge-alarms + +openconfig REST links: +* /restconf/data/openconfig-system:system/openconfig-events:events +* /restconf/data/openconfig-system:system/openconfig-events:event-stats +* /restconf/data/openconfig-system:system/alarms +* /restconf/data/openconfig-system:system/openconfig-alarms-ext:alarm-stats + +# 4 Flow Diagrams +![Sequence Diagram](event-alarm-framework-seqdiag.png) + +# 5 Warm Boot Support +## 5.1 Application warm boot +Applications confirming to the warm boot, should have stored their state and compare current values against previous values. +Such compliant application also "remembers" that it raised an event before for a specific condition. +They would +* not raise alarms/events for the same condition that it raised pre warm boot +* clear those alarms once current state of a particular condition is recovered (by comparing against the stored state). + +## 5.2 eventd warm boot +Records from applications are stored in a table, called EVENTPUBSUB. +Records that are being written will be queued when the consumer (eventd) is down. + +During normal operation, eventd reads, processes whenever a new record is added to the table. + +When eventd is restarted, events and alarms raised by applications will be waiting in a queue while eventd is coming up. +When eventd eventually comes back up, it reads those records in the queue. + +# 6 Scalability +In this feature, scalability applies to Event Table (EVENT). As it is persistent and it records every event generated on the system, to protect +against it growing indefinitely, user can limit its size through a manifest file. +By default, the size of Event Table is set to 40k events or events for 30 days - after which, older records are discarded to make way for new records. + +# 7 Showtech support +The techsupport bundle is upgraded to include output of "show event recent 60min” and “show alarm all”. +The first command displays all the events that were sent by applications for the last one hour. +The second command displays all the alarms that are waiting to be cleared by applications (this includes alarms that were acknowledged by operator as well). + +# 8 Unit Test +- Raise an event and verify the fields in EVENT table and EVENT_STATS table +- Raise an alarm and verify the fields in ALARM table and ALARM_STATS table +- Clear an alarm and verify that record is removed from ALARM and ALARM_STATS tables are udpated +- Ack an alarm and verify that acknowledged flag is set to true in ALARM table and acknowledge-time is set +- Un-Ack an alarm and verify that acknowledged flag is set to false in ALARM table and acknowledge-time is set +- Verify wrap around for EVENT table ( change manifest file to a lower range and trigger that many events ) +- Verify sequence-id for events is persistent by restarting +- Verify counters by raising various alarms with different severities +- Change severity of an event through custom event profile and verify it is logged at specified severity +- Change enable/disable of an event through custom event profile and verify it is suppressed +- Verify custom event profile with an invalid severity is rejected +- Verify custom event profile with an invalid enable/disable flag is rejected +- Verify custom event profile is persisted after a reboot +- Verify various show commands +- Verify 'logging-server event' command forwards only event log messages to the host