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Azure Media Services as an Event Grid source

  • Artikkeli

This article provides the schemas and properties for Media Services events.

Media Services emits the Job-related event types described below. There are two categories for the Job-related events: "Monitoring Job State Changes" and "Monitoring Job Output State Changes".

You can register for all of the events by subscribing to the JobStateChange event. Or, you can subscribe for specific events only (for example, final states like JobErrored, JobFinished, and JobCanceled).

Monitoring Job state changes

Event type Description
Microsoft.Media.JobStateChange Get an event for all Job State changes.
Microsoft.Media.JobScheduled Get an event when Job transitions to scheduled state.
Microsoft.Media.JobProcessing Get an event when Job transitions to processing state.
Microsoft.Media.JobCanceling Get an event when Job transitions to canceling state.
Microsoft.Media.JobFinished Get an event when Job transitions to finished state. This is a final state that includes Job outputs.
Microsoft.Media.JobCanceled Get an event when Job transitions to canceled state. This is a final state that includes Job outputs.
Microsoft.Media.JobErrored Get an event when Job transitions to error state. This is a final state that includes Job outputs.

See Schema examples that follow.

Monitoring job output state changes

A job may contain multiple job outputs (if you configured the transform to have multiple job outputs.) If you want to track the details of the individual job output, listen for a job output change event.

Each Job is going to be at a higher level than JobOutput, thus job output events get fired inside of a corresponding job.

The error messages in JobFinished, JobCanceled, JobError output the aggregated results for each job output – when all of them are finished. Whereas the job output events fire as each task finishes. For example, if you have an encoding output, followed by a Video Analytics output, you would get two events firing as job output events before the final JobFinished event fires with the aggregated data.

Event type Description
Microsoft.Media.JobOutputStateChange Get an event for all Job output State changes.
Microsoft.Media.JobOutputScheduled Get an event when Job output transitions to scheduled state.
Microsoft.Media.JobOutputProcessing Get an event when Job output transitions to processing state.
Microsoft.Media.JobOutputCanceling Get an event when Job output transitions to canceling state.
Microsoft.Media.JobOutputFinished Get an event when Job output transitions to finished state.
Microsoft.Media.JobOutputCanceled Get an event when Job output transitions to canceled state.
Microsoft.Media.JobOutputErrored Get an event when Job output transitions to error state.

See Schema examples that follow.

Monitoring job output progress

Event type Description
Microsoft.Media.JobOutputProgress This event reflects the job processing progress, from 0% to 100%. The service attempts to send an event if there has been 5% or greater increase in the progress value or it has been more than 30 seconds since the last event (heartbeat). The progress value isn't guaranteed to start at 0%, or to reach 100%, nor is it guaranteed to increase at a constant rate over time. This event shouldn't be used to determine that the processing has been completed – you should instead use the state change events.

See Schema examples that follow.

Live event types

Media Services also emits the Live event types described below. There are two categories for the Live events: stream-level events and track-level events.

Stream-level events

Stream-level events are raised per stream or connection. Each event has a StreamId parameter that identifies the connection or stream. Each stream or connection has one or more tracks of different types. For example, one connection from an encoder may have one audio track and four video tracks. The stream event types are:

Event type Description
Microsoft.Media.LiveEventConnectionRejected Encoder's connection attempt is rejected.
Microsoft.Media.LiveEventEncoderConnected Encoder establishes connection with live event.
Microsoft.Media.LiveEventEncoderDisconnected Encoder disconnects.

See Schema examples that follow.

Track-level events

Track-level events are raised per track.

Note

All track-level events are raised after a live encoder is connected.

The track-level event types are:

Event type Description
Microsoft.Media.LiveEventIncomingDataChunkDropped Media server drops data chunk because it's too late or has an overlapping timestamp (timestamp of new data chunk is less than the end time of the previous data chunk).
Microsoft.Media.LiveEventIncomingStreamReceived Media server receives first data chunk for each track in the stream or connection.
Microsoft.Media.LiveEventIncomingStreamsOutOfSync Media server detects audio and video streams are out of sync. Use as a warning because user experience may not be impacted.
Microsoft.Media.LiveEventIncomingVideoStreamsOutOfSync Media server detects any of the two video streams coming from external encoder are out of sync. Use as a warning because user experience may not be impacted.
Microsoft.Media.LiveEventIngestHeartbeat Published every 20 seconds for each track when live event is running. Provides ingest health summary.

After the encoder was initially connected, the heartbeat event continues to emit every 20 sec whether the encoder is still connected or not.
Microsoft.Media.LiveEventTrackDiscontinuityDetected Media server detects discontinuity in the incoming track.

See Schema examples that follow.

Event schema examples

JobStateChange

The following example shows the schema of the JobStateChange event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
    "subject": "transforms/VideoAnalyzerTransform/jobs/<job-id>",
    "type": "Microsoft.Media.JobStateChange",
    "time": "2018-04-20T21:26:13.8978772",
    "id": "b9d38923-9210-4c2b-958f-0054467d4dd7",
    "data": {
      "previousState": "Processing",
      "state": "Finished"
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
previousState string The state of the job before the event.
state string The new state of the job being notified in this event. For example, "Scheduled: The job is ready to start" or "Finished: The job is finished".

Where the Job state can be one of the values: Queued, Scheduled, Processing, Finished, Error, Canceled, Canceling

Note

Queued is only going to be present in the previousState property but not in the state property.

JobScheduled, JobProcessing, JobCanceling

For each non-final Job state change (such as JobScheduled, JobProcessing, JobCanceling), the example schema looks similar to the following:

[{
  "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
  "subject": "transforms/VideoAnalyzerTransform/jobs/<job-id>",
  "type": "Microsoft.Media.JobProcessing",
  "time": "2018-10-12T16:12:18.0839935",
  "id": "a0a6efc8-f647-4fc2-be73-861fa25ba2db",
  "data": {
    "previousState": "Scheduled",
    "state": "Processing",
    "correlationData": {
      "testKey1": "testValue1",
      "testKey2": "testValue2"
    }
  },
  "specversion": "1.0"
}]

JobFinished, JobCanceled, JobErrored

For each final Job state change (such as JobFinished, JobCanceled, JobErrored), the example schema looks similar to the following:

[{
  "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
  "subject": "transforms/VideoAnalyzerTransform/jobs/<job-id>",
  "type": "Microsoft.Media.JobFinished",
  "time": "2018-10-12T16:25:56.4115495",
  "id": "9e07e83a-dd6e-466b-a62f-27521b216f2a",
  "data": {
    "outputs": [
      {
        "@odata.type": "#Microsoft.Media.JobOutputAsset",
        "assetName": "output-7640689F",
        "error": null,
        "label": "VideoAnalyzerPreset_0",
        "progress": 100,
        "state": "Finished"
      }
    ],
    "previousState": "Processing",
    "state": "Finished",
    "correlationData": {
      "testKey1": "testValue1",
      "testKey2": "testValue2"
    }
  },
  "specversion": "1.0"
}]

The data object has the following properties:

Property Type Description
outputs Array Gets the Job outputs.

JobOutputStateChange

The following example shows the schema of the JobOutputStateChange event:

[{
  "topic": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
  "subject": "transforms/VideoAnalyzerTransform/jobs/<job-id>",
  "eventType": "Microsoft.Media.JobOutputStateChange",
  "eventTime": "2018-10-12T16:25:56.0242854",
  "id": "dde85f46-b459-4775-b5c7-befe8e32cf90",
  "data": {
    "previousState": "Processing",
    "output": {
      "@odata.type": "#Microsoft.Media.JobOutputAsset",
      "assetName": "output-7640689F",
      "error": null,
      "label": "VideoAnalyzerPreset_0",
      "progress": 100,
      "state": "Finished"
    },
    "jobCorrelationData": {
      "testKey1": "testValue1",
      "testKey2": "testValue2"
    }
  },
  "dataVersion": "1.0",
  "metadataVersion": "1"
}]

JobOutputScheduled, JobOutputProcessing, JobOutputFinished, JobOutputCanceling, JobOutputCanceled, JobOutputErrored

For each JobOutput state change, the example schema looks similar to the following:

[{
  "topic": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
  "subject": "transforms/VideoAnalyzerTransform/jobs/<job-id>",
  "eventType": "Microsoft.Media.JobOutputProcessing",
  "eventTime": "2018-10-12T16:12:18.0061141",
  "id": "f1fd5338-1b6c-4e31-83c9-cd7c88d2aedb",
  "data": {
    "previousState": "Scheduled",
    "output": {
      "@odata.type": "#Microsoft.Media.JobOutputAsset",
      "assetName": "output-7640689F",
      "error": null,
      "label": "VideoAnalyzerPreset_0",
      "progress": 0,
      "state": "Processing"
    },
    "jobCorrelationData": {
      "testKey1": "testValue1",
      "testKey2": "testValue2"
    }
  },
  "dataVersion": "1.0",
  "metadataVersion": "1"
}]

JobOutputProgress

The example schema looks similar to the following:

[{
  "topic": "/subscriptions/<subscription-id>/resourceGroups/belohGroup/providers/Microsoft.Media/mediaservices/<account-name>",
  "subject": "transforms/VideoAnalyzerTransform/jobs/job-5AB6DE32",
  "eventType": "Microsoft.Media.JobOutputProgress",
  "eventTime": "2018-12-10T18:20:12.1514867",
  "id": "00000000-0000-0000-0000-000000000000",
  "data": {
    "jobCorrelationData": {
      "TestKey1": "TestValue1",
      "testKey2": "testValue2"
    },
    "label": "VideoAnalyzerPreset_0",
    "progress": 86
  },
  "dataVersion": "1.0",
  "metadataVersion": "1"
}]

LiveEventConnectionRejected

The following example shows the schema of the LiveEventConnectionRejected event:

[
  {
    "topic": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaServices/<account-name>",
    "subject": "/LiveEvents/MyLiveEvent1",
    "eventType": "Microsoft.Media.LiveEventConnectionRejected",
    "eventTime": "2018-01-16T01:57:26.005121Z",
    "id": "b303db59-d5c1-47eb-927a-3650875fded1",
    "data": {
      "streamId":"Mystream1",
      "ingestUrl": "http://abc.ingest.isml",
      "encoderIp": "118.238.251.xxx",
      "encoderPort": 52859,
      "resultCode": "MPE_INGEST_CODEC_NOT_SUPPORTED"
    },
    "dataVersion": "1.0",
    "metadataVersion": "1"
  }
]

The data object has the following properties:

Property Type Description
streamId string Identifier of the stream or connection. Encoder or customer is responsible to add this ID in the ingest URL.
ingestUrl string Ingest URL provided by the live event.
encoderIp string IP of the encoder.
encoderPort string Port of the encoder from where this stream is coming.
resultCode string The reason the connection was rejected. The result codes are listed in the following table.

You can find the error result codes in live Event error codes.

LiveEventEncoderConnected

The following example shows the schema of the LiveEventEncoderConnected event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
    "subject": "liveEvent/mle1",
    "type": "Microsoft.Media.LiveEventEncoderConnected",
    "time": "2018-08-07T23:08:09.1710643",
    "id": "<id>",
    "data": {
      "ingestUrl": "http://mle1-amsts03mediaacctgndos-ts031.channel.media.azure-test.net:80/ingest.isml",
      "streamId": "15864-stream0",
      "encoderIp": "131.107.147.xxx",
      "encoderPort": "27485"
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
streamId string Identifier of the stream or connection. Encoder or customer is responsible for providing this ID in the ingest URL.
ingestUrl string Ingest URL provided by the live event.
encoderIp string IP of the encoder.
encoderPort string Port of the encoder from where this stream is coming.

LiveEventEncoderDisconnected

The following example shows the schema of the LiveEventEncoderDisconnected event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
    "subject": "liveEvent/mle1",
    "type": "Microsoft.Media.LiveEventEncoderDisconnected",
    "time": "2018-08-07T23:08:09.1710872",
    "id": "<id>",
    "data": {
      "ingestUrl": "http://mle1-amsts03mediaacctgndos-ts031.channel.media.azure-test.net:80/ingest.isml",
      "streamId": "15864-stream0",
      "encoderIp": "131.107.147.xxx",
      "encoderPort": "27485",
      "resultCode": "S_OK"
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
streamId string Identifier of the stream or connection. Encoder or customer is responsible to add this ID in the ingest URL.
ingestUrl string Ingest URL provided by the live event.
encoderIp string IP of the encoder.
encoderPort string Port of the encoder from where this stream is coming.
resultCode string The reason for the encoder disconnecting. It could be graceful disconnect or from an error. The result codes are listed in the following table.

You can find the error result codes in live Event error codes.

The graceful disconnect result codes are:

Result code Description
S_OK Encoder disconnected successfully.
MPE_CLIENT_TERMINATED_SESSION Encoder disconnected (RTMP).
MPE_CLIENT_DISCONNECTED Encoder disconnected (FMP4).
MPI_REST_API_CHANNEL_RESET Channel reset command is received.
MPI_REST_API_CHANNEL_STOP Channel stop command received.
MPI_REST_API_CHANNEL_STOP Channel undergoing maintenance.
MPI_STREAM_HIT_EOF EOF stream is sent by the encoder.

LiveEventIncomingDataChunkDropped

The following example shows the schema of the LiveEventIncomingDataChunkDropped event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaServices/<account-name>",
    "subject": "/LiveEvents/MyLiveEvent1",
    "type": "Microsoft.Media.LiveEventIncomingDataChunkDropped",
    "time": "2018-01-16T01:57:26.005121Z",
    "id": "03da9c10-fde7-48e1-80d8-49936f2c3e7d",
    "data": {
      "trackType": "Video",
      "trackName": "Video",
      "bitrate": 300000,
      "timestamp": 36656620000,
      "timescale": 10000000,
      "resultCode": "FragmentDrop_OverlapTimestamp"
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
trackType string Type of the track (Audio / Video).
trackName string Name of the track.
bitrate integer Bitrate of the track.
timestamp string Timestamp of the data chunk dropped.
timescale string Timescale of the timestamp.
resultCode string Reason of the data chunk drop. FragmentDrop_OverlapTimestamp or FragmentDrop_NonIncreasingTimestamp.

LiveEventIncomingStreamReceived

The following example shows the schema of the LiveEventIncomingStreamReceived event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
    "subject": "liveEvent/mle1",
    "type": "Microsoft.Media.LiveEventIncomingStreamReceived",
    "time": "2018-08-07T23:08:10.5069288Z",
    "id": "7f939a08-320c-47e7-8250-43dcfc04ab4d",
    "data": {
      "ingestUrl": "http://mle1-amsts03mediaacctgndos-ts031.channel.media.azure-test.net:80/ingest.isml/Streams(15864-stream0)15864-stream0",
      "trackType": "video",
      "trackName": "video",
      "bitrate": 2962000,
      "encoderIp": "131.107.147.xxx",
      "encoderPort": "27485",
      "timestamp": "15336831655032322",
      "duration": "20000000",
      "timescale": "10000000"
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
trackType string Type of the track (Audio / Video).
trackName string Name of the track (either provided by the encoder or, in case of RTMP, server generates in TrackType_Bitrate format).
bitrate integer Bitrate of the track.
ingestUrl string Ingest URL provided by the live event.
encoderIp string IP of the encoder.
encoderPort string Port of the encoder from where this stream is coming.
timestamp string First timestamp of the data chunk received.
timescale string Timescale in which timestamp is represented.

LiveEventIncomingStreamsOutOfSync

The following example shows the schema of the LiveEventIncomingStreamsOutOfSync event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
    "subject": "liveEvent/mle1",
    "type": "Microsoft.Media.LiveEventIncomingStreamsOutOfSync",
    "time": "2018-08-10T02:26:20.6269183Z",
    "id": "b9d38923-9210-4c2b-958f-0054467d4dd7",
    "data": {
      "minLastTimestamp": "319996",
      "typeOfStreamWithMinLastTimestamp": "Audio",
      "maxLastTimestamp": "366000",
      "typeOfStreamWithMaxLastTimestamp": "Video",
      "timescaleOfMinLastTimestamp": "10000000",
      "timescaleOfMaxLastTimestamp": "10000000"
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
minLastTimestamp string Minimum of last timestamps among all the tracks (audio or video).
typeOfTrackWithMinLastTimestamp string Type of the track (audio or video) with minimum last timestamp.
maxLastTimestamp string Maximum of all the timestamps among all the tracks (audio or video).
typeOfTrackWithMaxLastTimestamp string Type of the track (audio or video) with maximum last timestamp.
timescaleOfMinLastTimestamp string Gets the timescale in which "MinLastTimestamp" is represented.
timescaleOfMaxLastTimestamp string Gets the timescale in which "MaxLastTimestamp" is represented.

LiveEventIncomingVideoStreamsOutOfSync

The following example shows the schema of the LiveEventIncomingVideoStreamsOutOfSync event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaServices/<account-name>",
    "subject": "/LiveEvents/LiveEvent1",
    "type": "Microsoft.Media.LiveEventIncomingVideoStreamsOutOfSync",
    "time": "2018-01-16T01:57:26.005121Z",
    "id": "6dd4d862-d442-40a0-b9f3-fc14bcf6d750",
    "data": {
      "firstTimestamp": "2162058216",
      "firstDuration": "2000",
      "secondTimestamp": "2162057216",
      "secondDuration": "2000",
      "timescale": "10000000"
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
firstTimestamp string Timestamp received for one of the tracks/quality levels of type video.
firstDuration string Duration of the data chunk with first timestamp.
secondTimestamp string Timestamp received for some other track/quality level of the type video.
secondDuration string Duration of the data chunk with second timestamp.
timescale string Timescale of timestamps and duration.

LiveEventIngestHeartbeat

The following example shows the schema of the LiveEventIngestHeartbeat event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
    "subject": "liveEvent/mle1",
    "type": "Microsoft.Media.LiveEventIngestHeartbeat",
    "time": "2018-08-07T23:17:57.4610506",
    "id": "7f450938-491f-41e1-b06f-c6cd3965d786",
    "data": {
      "trackType": "audio",
      "trackName": "audio",
      "bitrate": 160000,
      "incomingBitrate": 155903,
      "lastTimestamp": "15336837535253637",
      "timescale": "10000000",
      "overlapCount": 0,
      "discontinuityCount": 0,
      "nonincreasingCount": 0,
      "unexpectedBitrate": false,
      "state": "Running",
      "healthy": true
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
trackType string Type of the track (Audio / Video).
trackName string Name of the track (either provided by the encoder or, in case of RTMP, server generates in TrackType_Bitrate format).
bitrate integer Bitrate of the track.
incomingBitrate integer Calculated bitrate based on data chunks coming from encoder.
lastTimestamp string Latest timestamp received for a track in last 20 seconds.
timescale string Timescale in which timestamps are expressed.
overlapCount integer Number of data chunks had overlapped timestamps in last 20 seconds.
discontinuityCount integer Number of discontinuities observed in last 20 seconds.
nonIncreasingCount integer Number of data chunks with timestamps in the past were received in last 20 seconds.
unexpectedBitrate bool If expected and actual bitrates differ by more than allowed limit in last 20 seconds. It's true if and only if, incomingBitrate >= 2* bitrate OR incomingBitrate <= bitrate/2 OR IncomingBitrate = 0.
state string State of the live event.
healthy bool Indicates whether ingest is healthy, based on the counts and flags. Healthy is true if overlapCount = 0 && discontinuityCount = 0 && nonIncreasingCount = 0 && unexpectedBitrate = false.
lastFragmentArrivalTime string The last time stamp in UTC that a fragment arrived at the ingest endpoint. Example date format is "2020-11-11 12:12:12:888999"
ingestDriftValue string Indicates the speed of delay, in seconds-per-minute, of the incoming audio or video data during the last minute. The value is greater than zero if data is arriving to the live event slower than expected in the last minute; zero if data arrived with no delay; and "n/a" if no audio or video data was received. For example, if you have a contribution encoder sending in live content, and it is slowing down due to processing issues, or network latency, it may be only able to deliver a total of 58 seconds of audio or video in a one minute period. This would be reported as 2 seconds-per-minute of drift. If the encoder is able to catch up and send all 60 seconds or more of data every minute you'll see this value reported as 0. If there was a disconnection, or discontinuity from the encoder, this value may still display as 0, as it doesn't account for breaks in the data - only data that is delayed in timestamps.
transcriptionState string This value is "On" for audio track heartbeats if live transcription is turned on, otherwise you'll see an empty string. This state is only applicable totracktype of audio for Live transcription. All other tracks will have an empty value.
transcriptionLanguage string The language code (in BCP-47 format) of the transcription language. For example “de-de” indicates German (Germany). The value is empty for the video track heartbeats, or when live transcription is turned off.

LiveEventTrackDiscontinuityDetected

The following example shows the schema of the LiveEventTrackDiscontinuityDetected event:

[
  {
    "source": "/subscriptions/<subscription-id>/resourceGroups/<rg-name>/providers/Microsoft.Media/mediaservices/<account-name>",
    "subject": "liveEvent/mle1",
    "type": "Microsoft.Media.LiveEventTrackDiscontinuityDetected",
    "time": "2018-08-07T23:18:06.1270405Z",
    "id": "5f4c510d-5be7-4bef-baf0-64b828be9c9b",
    "data": {
      "trackName": "video",
      "previousTimestamp": "15336837615032322",
      "trackType": "video",
      "bitrate": 2962000,
      "newTimestamp": "15336837619774273",
      "discontinuityGap": "575284",
      "timescale": "10000000"
    },
    "specversion": "1.0"
  }
]

The data object has the following properties:

Property Type Description
trackType string Type of the track (Audio / Video).
trackName string Name of the track (either provided by the encoder or, in case of RTMP, server generates in TrackType_Bitrate format).
bitrate integer Bitrate of the track.
previousTimestamp string Timestamp of the previous fragment.
newTimestamp string Timestamp of the current fragment.
discontinuityGap string Gap between above two timestamps.
timescale string Timescale in which both timestamp and discontinuity gap are represented.

Common event properties

An event has the following top-level data:

Property Type Description
source string The Event Grid topic. This property has the resource ID for the Media Services account.
subject string The resource path for the Media Services channel under the Media Services account. Concatenating the topic and subject give you the resource ID for the job.
type string One of the registered event types for this event source. For example, "Microsoft.Media.JobStateChange".
time string The time the event is generated based on the provider's UTC time.
id string Unique identifier for the event.
data object Media Services event data.
specversion string CloudEvents schema specification version.

Next steps

See Register for job state change events

See also