[1.x] Add event.category session. (#1049) (#1093)

Co-authored-by: Mathieu Martin <mathieu.martin@elastic.co>

CHANGELOG.next.md

@@ -10,6 +10,8 @@ Thanks, you're awesome :-) -->
 
 ### Schema Changes
 
+* Added `event.category` "session". #1049
+
 #### Breaking changes
 
 #### Bugfixes

docs/field-details.asciidoc

@@ -1597,7 +1597,7 @@ Note: this field should contain an array of values.
 
 *Important*: The field value must be one of the following:
 
-authentication, configuration, database, driver, file, host, iam, intrusion_detection, malware, network, package, process, web
+authentication, configuration, database, driver, file, host, iam, intrusion_detection, malware, network, package, process, session, web
 
 To learn more about when to use which value, visit the page
 <<ecs-allowed-values-event-category,allowed values for event.category>>

docs/field-values.asciidoc

@@ -144,6 +144,7 @@ that will require subsequent breaking changes.
 * <<ecs-event-category-network,network>>
 * <<ecs-event-category-package,package>>
 * <<ecs-event-category-process,process>>
+* <<ecs-event-category-session,session>>
 * <<ecs-event-category-web,web>>
 
 [float]
@@ -298,6 +299,18 @@ Use this category of events to visualize and analyze process-specific informatio
 access, change, end, info, start
 
 
+[float]
+[[ecs-event-category-session]]
+==== session
+
+The session category is applied to events and metrics regarding logical persistent connections to hosts and services. Use this category to visualize and analyze interactive or automated persistent connections between assets. Data for this category may come from Windows Event logs, SSH logs, or stateless sessions such as HTTP cookie-based sessions, etc.
+
+
+*Expected event types for category session:*
+
+start, end, info
+
+
 [float]
 [[ecs-event-category-web]]
 ==== web

experimental/generated/ecs/ecs_flat.yml

@@ -1774,6 +1774,16 @@ event.category:
     - info
     - start
     name: process
+  - description: The session category is applied to events and metrics regarding logical
+      persistent connections to hosts and services. Use this category to visualize
+      and analyze interactive or automated persistent connections between assets.
+      Data for this category may come from Windows Event logs, SSH logs, or stateless
+      sessions such as HTTP cookie-based sessions, etc.
+    expected_event_types:
+    - start
+    - end
+    - info
+    name: session
   - description: 'Relating to web server access. Use this category to create a dashboard
       of web server/proxy activity from apache, IIS, nginx web servers, etc. Note:
       events from network observers such as Zeek http log may also be included in

experimental/generated/ecs/ecs_nested.yml

@@ -2168,6 +2168,16 @@ event:
         - info
         - start
         name: process
+      - description: The session category is applied to events and metrics regarding
+          logical persistent connections to hosts and services. Use this category
+          to visualize and analyze interactive or automated persistent connections
+          between assets. Data for this category may come from Windows Event logs,
+          SSH logs, or stateless sessions such as HTTP cookie-based sessions, etc.
+        expected_event_types:
+        - start
+        - end
+        - info
+        name: session
       - description: 'Relating to web server access. Use this category to create a
           dashboard of web server/proxy activity from apache, IIS, nginx web servers,
           etc. Note: events from network observers such as Zeek http log may also

generated/ecs/ecs_flat.yml

@@ -1814,6 +1814,16 @@ event.category:
     - info
     - start
     name: process
+  - description: The session category is applied to events and metrics regarding logical
+      persistent connections to hosts and services. Use this category to visualize
+      and analyze interactive or automated persistent connections between assets.
+      Data for this category may come from Windows Event logs, SSH logs, or stateless
+      sessions such as HTTP cookie-based sessions, etc.
+    expected_event_types:
+    - start
+    - end
+    - info
+    name: session
   - description: 'Relating to web server access. Use this category to create a dashboard
       of web server/proxy activity from apache, IIS, nginx web servers, etc. Note:
       events from network observers such as Zeek http log may also be included in

generated/ecs/ecs_nested.yml

@@ -2209,6 +2209,16 @@ event:
         - info
         - start
         name: process
+      - description: The session category is applied to events and metrics regarding
+          logical persistent connections to hosts and services. Use this category
+          to visualize and analyze interactive or automated persistent connections
+          between assets. Data for this category may come from Windows Event logs,
+          SSH logs, or stateless sessions such as HTTP cookie-based sessions, etc.
+        expected_event_types:
+        - start
+        - end
+        - info
+        name: session
       - description: 'Relating to web server access. Use this category to create a
           dashboard of web server/proxy activity from apache, IIS, nginx web servers,
           etc. Note: events from network observers such as Zeek http log may also

schemas/event.yml

@@ -277,6 +277,15 @@
             - end
             - info
             - start
+        - name: session
+          description: >
+            The session category is applied to events and metrics regarding logical persistent connections to hosts and services.
+            Use this category to visualize and analyze interactive or automated persistent connections between assets.
+            Data for this category may come from Windows Event logs, SSH logs, or stateless sessions such as HTTP cookie-based sessions, etc.
+          expected_event_types:
+            - start
+            - end
+            - info
         - name: web
           description: >
             Relating to web server access. Use this category to create a dashboard of