Lambda Telemetry API `Event` schema reference

Use the Lambda Telemetry API endpoint to subscribe extensions to telemetry streams. You can retrieve the Telemetry API endpoint from the AWS_LAMBDA_RUNTIME_API environment variable. To send an API request, append the API version (2022-07-01/) and telemetry/. For example:

http://${AWS_LAMBDA_RUNTIME_API}/2022-07-01/telemetry/

Note
We will update this section with the OpenAPI Specification (OAS) definition of the latest version of the Telemetry API for HTTP and TCP protocols in the coming weeks.

The following table is a summary of all the types of Event objects that the Telemetry API supports.

Telemetry API message types

Category	Event type	Description	Event record schema
Platform event	`platform.initStart`	Function initialization started.	`platform.initStart` schema
Platform event	`platform.initRuntimeDone`	Function initialization completed.	`platform.initRuntimeDone` schema
Platform event	`platform.initReport`	A report of function initialization.	`platform.initReport` schema
Platform event	`platform.start`	Function invocation started.	`platform.start` schema
Platform event	`platform.runtimeDone`	The runtime finished processing an event with either success or failure.	`platform.runtimeDone` schema
Platform event	`platform.report`	A report of function invocation.	`platform.report` schema
Platform event	`platform.telemetrySubscription`	The extension subscribed to the Telemetry API.	`platform.telemetrySubscription` schema
Platform event	`platform.logsDropped`	Lambda dropped log entries.	`platform.logsDropped` schema
Function logs	`function`	A log line from function code.	`function` schema
Extension logs	`extension`	A log line from extension code.	`extension` schema

Contents

Telemetry API Event object types
Shared object types

Telemetry API `Event` object types

This section details the types of Event objects that the Lambda Telemetry API supports. In the event descriptions, a question mark (?) indicates that the attribute may not be present in the object.

`platform.initStart`

A platform.initStart event indicates that the function initialization phase has started. A platform.initStart Event object has the following shape:

Event: Object
- time: String
- type: String = platform.initStart
- record: PlatformInitStart

The PlatformInitStart object has the following attributes:

initializationType – InitType object
phase – InitPhase object
runtimeArn? – String
runtimeVersion? – String

The following is an example Event of type platform.initStart:

{
    "time": "2022-10-12T00:00:15.064Z",
    "type": "platform.initStart",
    "record": {
        "initializationType": "on-demand",
        "phase": "init",
        "runtimeVersion": "nodejs-14.v3",
        "runtimeVersionArn": "arn"
    }
}

`platform.initRuntimeDone`

A platform.initRuntimeDone event indicates that the function initialization phase has completed. A platform.initRuntimeDone Event object has the following shape:

Event: Object
- time: String
- type: String = platform.initRuntimeDone
- record: PlatformInitRuntimeDone

The PlatformInitRuntimeDone object has the following attributes:

initializationType – InitType object
phase – InitPhase object
status – Status object
spans? – List of Span objects

The following is an example Event of type platform.initRuntimeDone:

{
    "time": "2022-10-12T00:01:15.000Z",
    "type": "platform.initRuntimeDone",
    "record": {
        "initializationType": "on-demand"
        "status": "success",
        "spans": [
            {
                "name": "someTimeSpan",
                "start": "2022-06-02T12:02:33.913Z",
                "durationMs": 70.5
            }
        ]
    }
}

`platform.initReport`

A platform.initReport event contains an overall report of the function initialization phase. A platform.initReport Event object has the following shape:

Event: Object
- time: String
- type: String = platform.initReport
- record: PlatformInitReport

The PlatformInitReport object has the following attributes:

initializationType – InitType object
phase – InitPhase object
metrics – InitReportMetrics object
spans? – List of Span objects

The following is an example Event of type platform.initReport:

{
    "time": "2022-10-12T00:01:15.000Z",
    "type": "platform.initReport",
    "record": {
        "initializationType": "on-demand",
        "phase": "init",
        "metrics": {
            "durationMs": 125.33
        },
        "spans": [
            {
                "name": "someTimeSpan",
                "start": "2022-06-02T12:02:33.913Z",
                "durationMs": 90.1
            }
        ]
    }
}

`platform.start`

A platform.start event indicates that the function invocation phase has started. A platform.start Event object has the following shape:

Event: Object
- time: String
- type: String = platform.start
- record: PlatformStart

The PlatformStart object has the following attributes:

requestId – String
version? – String
tracing? – TraceContext

The following is an example Event of type platform.start:

{
    "time": "2022-10-12T00:00:15.064Z",
    "type": "platform.initStart",
    "record": {
        "requestId": "6d68ca91-49c9-448d-89b8-7ca3e6dc66aa",
        "version": "$LATEST",
        "tracing": {
            "spanId": "54565fb41ac79632",
            "type": "X-Amzn-Trace-Id",
            "value": "Root=1-62e900b2-710d76f009d6e7785905449a;Parent=0efbd19962d95b05;Sampled=1"
        }
    }
}

`platform.runtimeDone`

A platform.runtimeDone event indicates that the function invocation phase has completed. A platform.runtimeDone Event object has the following shape:

Event: Object
- time: String
- type: String = platform.runtimeDone
- record: PlatformRuntimeDone

The PlatformRuntimeDone object has the following attributes:

metrics? – RuntimeDoneMetrics object
requestId – String
status – Status object
spans? – List of Span objects
tracing? – TraceContext object

The following is an example Event of type platform.runtimeDone:

{
    "time": "2022-10-12T00:01:15.000Z",
    "type": "platform.runtimeDone",
    "record": {
        "requestId": "6d68ca91-49c9-448d-89b8-7ca3e6dc66aa",
        "status": "success",
        "tracing": {
            "spanId": "54565fb41ac79632",
            "type": "X-Amzn-Trace-Id",
            "value": "Root=1-62e900b2-710d76f009d6e7785905449a;Parent=0efbd19962d95b05;Sampled=1"
        },
        "spans": [
            {
                "name": "someTimeSpan",
                "start": "2022-08-02T12:01:23:521Z",
                "durationMs": 80.0
            }
        ],
        "metrics": {
            "durationMs": 140.0,
            "producedBytes": 16
        }
    }
}

`platform.report`

A platform.report event contains an overall report of the function initialization phase. A platform.report Event object has the following shape:

Event: Object
- time: String
- type: String = platform.report
- record: PlatformReport

The PlatformReport object has the following attributes:

metrics – ReportMetrics object
requestId – String
spans? – List of Span objects
status – Status object
tracing? – TraceContext object

The following is an example Event of type platform.report:

{
    "time": "2022-10-12T00:01:15.000Z",
    "type": "platform.report",
    "record": {
        "metrics": {
            "billedDurationMs": 694,
            "durationMs": 693.92,
            "initDurationMs": 397.68,
            "maxMemoryUsedMB": 84,
            "memorySizeMB": 128
        },
        "requestId": "6d68ca91-49c9-448d-89b8-7ca3e6dc66aa",
    }
}

`platform.extension`

An extension event contains logs from the extension code. An extension Event object has the following shape:

Event: Object
- time: String
- type: String = extension
- record: {}

The PlatformExtension object has the following attributes:

events – List of String
name – String
state – String

The following is an example Event of type platform.extension:

{
    "time": "2022-10-12T00:02:15.000Z",
    "type": "platform.extension",
    "record": {
        "events": [ "INVOKE", "SHUTDOWN" ],
        "name": "my-telemetry-extension",
        "state": "Ready"
    }
}

`platform.telemetrySubscription`

A platform.telemetrySubscription event contains information about an extension subscription. A platform.telemetrySubscription Event object has the following shape:

Event: Object
- time: String
- type: String = platform.telemetrySubscription
- record: PlatformTelemetrySubscription

The PlatformTelemetrySubscription object has the following attributes:

name – String
state – String
types – List of String

The following is an example Event of type platform.telemetrySubscription:

{
    "time": "2022-10-12T00:02:35.000Z",
    "type": "platform.telemetrySubscription",
    "record": {
        "name": "my-telemetry-extension",
        "state": "Subscribed",
        "types": [ "platform", "function" ]
    }
}

`platform.logsDropped`

A platform.logsDropped event contains information about dropped events. Lambda emits the platform.logsDropped event when an extension can't process one or more events. A platform.logsDropped Event object has the following shape:

Event: Object
- time: String
- type: String = platform.logsDropped
- record: PlatformLogsDropped

The PlatformLogsDropped object has the following attributes:

droppedBytes – Integer
droppedRecords – Integer
reason – String

The following is an example Event of type platform.logsDropped:

{
    "time": "2022-10-12T00:02:35.000Z",
    "type": "platform.logsDropped",
    "record": {
        "droppedBytes": 12345,
        "droppedRecords": 123,
        "reason": "Consumer seems to have fallen behind as it has not acknowledged receipt of logs."
    }
}

`function`

A function event contains logs from the function code. A function Event object has the following shape:

Event: Object
- time: String
- type: String = function
- record: {}

The following is an example Event of type function:

{
    "time": "2022-10-12T00:03:50.000Z",
    "type": "function",
    "record": "[INFO] Hello world, I am a function!"
}

`extension`

A extension event contains logs from the extension code. A extension Event object has the following shape:

Event: Object
- time: String
- type: String = extension
- record: {}

The following is an example Event of type extension:

{
    "time": "2022-10-12T00:03:50.000Z",
    "type": "extension",
    "record": "[INFO] Hello world, I am an extension!"
}

Shared object types

This section details the types of shared objects that the Lambda Telemetry API supports.

`InitPhase`

A string enum that describes the phase when the initialization step occurs. In most cases, Lambda runs the function initialization code during the init phase. However, in some error cases, Lambda may re-run the function initialization code during the invoke phase. (This is called a suppressed init.)

Type – String
Valid values – init|invoke

`InitReportMetrics`

An object that contains metrics about an initialization phase.

Type – Object

An InitReportMetrics object has the following shape:

InitReportMetrics: Object
- durationMs: Double

The following is an example InitReportMetrics object:

{
    "durationMs": 247.88
}

`InitType`

A string enum that describes how Lambda initialized the environment.

Type – String
Valid values – on-demand|provisioned-concurrency

`ReportMetrics`

An object that contains metrics about a completed phase.

Type – Object

A ReportMetrics object has the following shape:

ReportMetrics: Object
- billedDurationMs: Integer
- durationMs: Double
- initDurationMs?: Double
- maxMemoryUsedMB: Integer
- memorySizeMB: Integer
- restoreDurationMs?: Double

The following is an example ReportMetrics object:

{
    "billedDurationMs": 694,
    "durationMs": 693.92,
    "initDurationMs": 397.68,
    "maxMemoryUsedMB": 84,
    "memorySizeMB": 128
}

`RuntimeDoneMetrics`

An object that contains metrics about an invocation phase.

Type – Object

A RuntimeDoneMetrics object has the following shape:

RuntimeDoneMetrics: Object
- durationMs: Double
- producedBytes?: Integer

The following is an example RuntimeDoneMetrics object:

{
    "durationMs": 200.0,
    "producedBytes": 15
}

Span

An object that contains details about a span. A span represents a unit of work or operation in a trace. For more information about spans, see Span on the Tracing API page of the OpenTelemetry Docs website.

Lambda supports the following two spans for the platform.RuntimeDone event:

The responseLatency span describes how long it took your Lambda function to start sending the response.
The responseDuration span describes how long it took your Lambda function to finish sending the entire response.

The following is an example responseLatency span object:

{
        "name": "responseLatency", 
        "start": "2022-08-02T12:01:23.521Z",
        "durationMs": 23.02
      }

`Status`

An object that describes the status of an initialization or invocation phase. If the status is either failure or error, then the Status object also contains an errorType field describing the error.

Type – Object
Valid status values – success|failure|error

`TraceContext`

An object that describes the properties of a trace.

Type – Object

A TraceContext object has the following shape:

TraceContext: Object
- spanId?: String
- type: TracingType enum
- value: String

The following is an example TraceContext object:

{
    "spanId": "073a49012f3c312e",
    "type": "X-Amzn-Trace-Id",
    "value": "Root=1-62e900b2-710d76f009d6e7785905449a;Parent=0efbd19962d95b05;Sampled=1"
}

`TracingType`

A string enum that describes the type of tracing in a TraceContext object.

Type – String
Valid values – X-Amzn-Trace-Id

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Lambda Telemetry API `Event` schema reference

Telemetry API `Event` object types

`platform.initStart`

`platform.initRuntimeDone`

`platform.initReport`

`platform.start`

`platform.runtimeDone`

`platform.report`

`platform.extension`

`platform.telemetrySubscription`

`platform.logsDropped`

`function`

`extension`

Shared object types

`InitPhase`

`InitReportMetrics`

`InitType`

`ReportMetrics`

`RuntimeDoneMetrics`

Span

`Status`

`TraceContext`

`TracingType`

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Lambda Telemetry API Event schema reference

Telemetry API Event object types

platform.initStart

platform.initRuntimeDone

platform.initReport

platform.start

platform.runtimeDone

platform.report

platform.extension

platform.telemetrySubscription

platform.logsDropped

function

extension

Shared object types

InitPhase

InitReportMetrics

InitType

ReportMetrics

RuntimeDoneMetrics

Span

Status

TraceContext

TracingType

Lambda Telemetry API `Event` schema reference

Telemetry API `Event` object types

`platform.initStart`

`platform.initRuntimeDone`

`platform.initReport`

`platform.start`

`platform.runtimeDone`

`platform.report`

`platform.extension`

`platform.telemetrySubscription`

`platform.logsDropped`

`function`

`extension`

`InitPhase`

`InitReportMetrics`

`InitType`

`ReportMetrics`

`RuntimeDoneMetrics`

`Status`

`TraceContext`

`TracingType`