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specification/metrics/semantic_conventions/faas-metrics.md
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| # General | ||
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| The conventions described in this section are FaaS (function as a service) specific. When FaaS operations occur, | ||
| metric events about those operations will be generated and reported to provide insight into the | ||
| operations. By adding FaaS labels to metric events it allows for finely tuned filtering. | ||
| The conventions described in this section aim both Functions running as a service (FaaS) and on-premise setups. When Functions are operated, metric events about those operations will be generated and reported to provide insight into the | ||
| operations. By adding Functions dedicated labels to metric events it allows for finely tuned filtering. | ||
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| **Disclaimer:** These are initial FaaS metric instruments and labels but more may be added in the future. | ||
| **Disclaimer:** These are initial Function metric instruments and labels but more may be added in the future. Not all instruments | ||
| apply to all environments. | ||
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| ## Metric Instruments | ||
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| The following metric instruments MUST be used to describe FaaS operations. They MUST be of the specified | ||
| The following metric instruments MUST be used to describe Function operations. They MUST be of the specified | ||
| type and units. | ||
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| ### FaaS Invocations | ||
| ### Function Invocations | ||
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| Below is a table of FaaS invocation metric instruments. | ||
| Below is a table of Function invocation metric instruments. | ||
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| | Name | Instrument | Units | Description | | ||
| |------|------------|----|--|-------------| | ||
| | `faas.invoke_duration` | ValueRecorder | milliseconds | Measures the duration of the invocation | | ||
| | `faas.init_duration` | ValueRecorder | milliseconds | Measures the duration of the function's initialization, such as a cold start | | ||
| | `faas.coldstarts` | Counter | number of cold starts | Number of invocation cold starts. | | ||
| | `faas.errors` | Counter | number of errors | Number of invocation errors. | | ||
| | `faas.executions` | counter | number of invocations | number of successful invocations. | | ||
| | `faas.timeouts` | counter | number of timeouts | number of invocation timeouts. | | ||
| |------|------------|-------|-------------| | ||
| | `func.invoke_duration` | ValueRecorder | milliseconds | Measures the duration of the invocation where real work is being done. | | ||
| | `func.init_duration` | ValueRecorder | milliseconds | Measures the duration of the function's initialization, such as a cold start | | ||
| | `func.coldstarts` | Counter | number of cold starts | Number of invocation cold starts. | | ||
| | `func.errors` | Counter | number of errors | Number of invocation errors. | | ||
| | `func.executions` | Counter | number of invocations | number of successful invocations. | | ||
| | `func.timeouts` | Counter | number of timeouts | number of invocation timeouts. | | ||
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| ## Labels | ||
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| Below is a table of the labels that SHOULD be included on FaaS metric events. | ||
| Below is a table of the labels that SHOULD be included on Func metric events if applicable. | ||
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| | Name | Recommended | Notes and examples | | ||
| |------|-------------|--------------------| | ||
| | `faas.trigger` | Yes | Type of the trigger on which the function is invoked. SHOULD be one of: `datasource`, `http`, `pubsub`, `timer`, `other` | | ||
| | `faas.invoked_name` | Yes | Name of the invoked function. Example: `my-function` | | ||
| | `faas.invoked_provider` | Yes | Cloud provider of the invoked function. Corresponds to the resource `cloud.provider`. Example: `aws` | | ||
| | `faas.invoked_region` | Yes | Cloud provider region of invoked function. Corresponds to resource `cloud.region`. Example: `us-east-1` | | ||
| | `func.trigger` | Yes | Type of the trigger on which the function is invoked. SHOULD be one of: `datasource`, `http`, `pubsub`, `timer`, `other` | | ||
| | `func.invoked_name` | Yes | Name of the invoked function. Example: `my-function` | | ||
| | `func.invoked_provider` | Yes | Cloud provider of the invoked function. Corresponds to the resource `cloud.provider`. Example: `aws` | | ||
| | `func.invoked_region` | Yes | Cloud provider region of invoked function. Corresponds to resource `cloud.region`. Example: `us-east-1` | | ||
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| ## References | ||
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| ### Metric Reference | ||
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| Below are links to documentation regarding metrics that are available with different | ||
| FaaS providers. This list is not exhaustive. | ||
| FaaS providers and other vendors. This list is not exhaustive. | ||
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| * [AWS Lambda Metrics](https://docs.aws.amazon.com/lambda/latest/dg/monitoring-metrics.html) | ||
| * [Azure Functions Metrics](https://docs.microsoft.com/en-us/azure/azure-monitor/platform/metrics-supported) | ||
| * [Google CloudFunctions Metrics](https://cloud.google.com/monitoring/api/metrics_gcp#gcp-cloudfunctions) | ||
| * [OpenFaas Metrics](https://docs.openfaas.com/architecture/metrics/) | ||
| * [Openwhisk Metrics](https://github.com/apache/openwhisk/blob/master/docs/metrics.md) |