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Event Tracking

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Event tracking enables you to view real-time information about messages being processed by a specific flow. You can view message payloads before, during, and after they are processed, and you can view information about the message processors in the flow and message metadata.

Event tracking enables you to view business transactions and events on your Mule servers so that you can track and analyze the flow and disposition of particular messages. For example, you can use the data to perform root cause analysis on a failure within a business transaction, or to identify message processing bottlenecks.

Notification Types

Mule runtime engine notifies you about flow component execution. See Mule Events.

For the types of notifications that Mule provides, see Notification Interfaces.

Pushed Event Information

For each notification, the Runtime Manager agent pushes the following information to the event tracking service:

  • timestamp

    Timestamp for the event

  • notificationType

    Event type, such as Message Processor event or Inbound Endpoint event

  • action

    Event action, such as Begin, End, Complete, or Rollback

  • resourceIdentifier

    Name of the flow

  • muleMessage

    (If configured) Serialized Mule message or an error message.

The Runtime Manager agent doesn’t send this information:

  • Mule Message ID

  • Exception

    Message and stack trace in case of an exception

  • Path

    Component Mule path

  • Annotations

    Annotations for the component, if any

  • Application

Event Tracking Notifications

The Runtime Manager agent stores event tracking notifications for Mule apps, and then streams them to an event tracking service. Depending on your network topology and the design of your Mule apps, copying event tracking notifications over the network from the Runtime Manager agent to the online event tracking service can significantly impact performance.

You can reduce performance impact by specifying tracking levels at different granularities. You can specify a global event tracking level, and then override it in named Mule apps. You can further override the event tracking level in specific named flows within a Mule app.

In addition to the event tracking level, you can use a message replay facility to store every message for replay. Although it might lead to duplicate message processing, the replay facility provides a mechanism for operations to recover and replay failed transactions. As with tracking levels, you can configure the replay level globally, and then override the level for specific Mule apps, or flows within a Mule app.

Event Tracking Levels

The available event tracking levels are:

  • None

    Specifies no debugging.

  • BE

    Tracks only events related to business events.

  • Tracking

    Tracks BE level plus endpoint, exception strategy, and transaction-related notifications.

  • Debug + Specifies Tracking level plus additional component and message processor notifications.

    Because setting event tracking to Debug can result in slow performance, use this tracking level for debugging only.

The following table lists the types of notifications active in each debugging level.

MULE TYPE is the org.mule.api.context.notification.ServerNotification subclass (in the org.mule.context.notification package) that defines the notification type.

NOTIFICATIONS MULE TYPE NONE BE TRACKING DEBUG

Pipeline Message

PipelineMessageNotifications

√

√

√

Async Message

AsyncMessageNotifications

√

√

√

Exception

ExceptionStrategyNotifications

√

√

√

Event

EventNotifications

√

√

√

Exception Strategy

ExceptionStrategyNotifications

√

√

Transaction

TransactionNotifications

√

√

Endpoint Message

EndpointMessageNotifications

√

√

Message Processor

MessageProcessorNotification

√

Component Message

ComponentMessageNotifications

√

Configure Event Tracking

You can configure the tracking level for all apps (global), a single app, or for a flow.

  • Global

    Specifies how to track all apps, and their flows, deployed to Mule runtime engine.

  • App

    Overrides the global tracking level for the specific app.

  • Flow

    Overrides the global or app tracking for the specific flow.

Configure Event Tracking in mule-agent.yml

You can configure event tracking in mule-agent.yml:

Configure Event Tracking Globally for All Mule Applications

The global configuration specifies how to track all apps, and their flows, deployed to Mule runtime engine. You set the tracking configuration levels in the services/mule.agent.tracking.service section of the mule-agent.yml file.

This example sets the global tracking to TRACKING. See Event Tracking Levels for detailed descriptions of the tracking levels.

In mule-agent.yml:

services:
 mule.agent.tracking.service:
 globalTrackingLevel: TRACKING

Configure Tracking for a Mule App

You can override the global tracking configuration by setting tracking for a Mule app.

The Mule app tracking properties are: trackingLevel, replayLevel, and trackedFlows.

  • trackingLevel

    Specifies one of the four tracking levels: NONE, BE, TRACKING, or DEBUG. This tracking level affects every flow in the Mule app. See Event Tracking Levels.

  • `replayLevel’

    Specifies how to store each message through every flow of the Mule app for possible replay: NONE, SOURCED, or ALL.

Replay Level Option Description

NONE

Specifies to not store any data related to message replay and to disable the replay feature for these flows.

SOURCED

Stores messages for replay for only those flows in the Mule app that start with a message source.

ALL

Stores messages for replay for every flow in the Mule app.

This example sets the tracking level for the app mule-flights and its flow to TRACKING, and disables the message replay facility. The mule-flights app sends some notifications to the event tracking service, but doesn’t copy each received message. None of the flows in the mule-flights app can be replayed from the event tracking service.

This example also sets globalTrackingLevel to BE, which overrides the default value of NONE. With this setting, other Mule apps are also tracked at the BE level.

In mule-agent.yml:

services:
 mule.agent.tracking.service:
 globalTrackingLevel: BE
 trackedApplications:
    - appName: mule-flights
      trackingLevel: TRACKING
      replayLevel: NONE

Configure Tracking for Flows in a Mule App

You can override global and app settings for flows in the specified Mule app by adding the trackedFlows element. This element specifies what to track for a flow, and how message replay behaves.

This table describes the tracked flows options:

Tracked Flow Option Description

flow name

The name of the flow, as it is coded in the Mule app XML configuration file.

tracking level

One of the values NONE, BE, TRACKING, or DEBUG. See Event Tracking Levels.

replayLevel

One of the values NONE, SOURCED, or ALL. See the Replay Levels table.

payloadExcluded

Whether to also store the message payload for replay, or to just store the message metadata (if replayLevel is SOURCED or ALL).

This example adds tracking to a flow in the mule-flights app. The global and Mule app tracking use the default values (NONE).

In mule-agent.yml:

services:
  mule.agent.tracking.service:
    trackedApplications:
      - appName: mule-flights
        trackedFlows:
          - flowName: purchaseFlight
            trackingLevel: DEBUG
            replayLevel: ALL

Complex Tracking Example

This example sets tracking levels: global, Mule app, and flow.

Global:

  • globalTrackingLevel set to NONE, which is the default setting if you don’t specify globalTrackingLevel.

App mule-flights:

  • trackingLevel: TRACKING level for the apps.

  • replayLevel: NONE for the app. Messages are not stored and replay is disabled.

    • Flow purchaseFlight:

      • trackingLevel: DEBUG level for this one flow (overrides the TRACKING level).

      • replayLevel: ALL for this one flow. Saves every message for replay, even if the flow does not have a message source.

App mule-ticketing:

  • trackingLevel: BE for the app.

  • replayLevel: SOURCE for the app. Messages are not stored and replay is disabled.

    • Flow confirmReservation:

      • trackingLevel: DEBUG level for this one flow (overrides the TRACKING level).

      • replayLevel: ALL for this one flow. Saves every message for replay, even if the flow does not have a message source.

All other apps in the Mule instance, and their flows:

  • trackingLevel: NONE (the default)

In mule-agent.yml:

services:
  mule.agent.tracking.service:
    globalTrackingLevel: NONE
    trackedApplications:
      - appName: mule-flights
        trackingLevel: TRACKING
        replayLevel: NONE
        trackedFlows:
          - flowName: purchaseFlight
            trackingLevel: DEBUG
            replayLevel: ALL
          - flowName: help
            trackingLevel: NONE
            replayLevel: NONE
      - appName: mule-ticketing
        trackingLevel: BE
        replayLevel: SOURCE
        trackedFlows:
          - flowName: confirmReservation
            trackingLevel: DEBUG
            replayLevel: ALL

Configure Tracking Using the Agent API During Runtime

The agent API enables you to change the agent tracking configuration during runtime. For example, you can use the API to change the tracking configuration of a running app.

Retrieve the Current Configuration

This example retrieves information about the tracking service. The retrieved information includes the configurable fields with their current values.

Request:

GET <Runtime Manager Agent URL>/mule/agent/mule.agent.tracking.service

Response:

"configurableFields": [
    {
      "name": "globalTrackingLevel",
      "valueType": "com.mulesoft.agent.services.tracking.TrackingLevel",
      "value": "NONE",
      "configurableType": "DYNAMIC",
      "description": ""
    },
    {
      "name": "trackedApplications",
      "valueType": "[Lcom.mulesoft.agent.services.tracking.TrackedApplication;",
      "value": [],
      "configurableType": "DYNAMIC",
      "description": ""
    }
  ],
  "injectedHandlers": [
    {
      "name": "com.mulesoft.agent.handlers.internal.InternalTrackingNotificationHandler",
      "path": "/mule/agent/tracking.notification.internal.message.handler/configuration",
      "type": "class com.mulesoft.agent.domain.tracking.AgentTrackingNotification"
    }
  ],
  "serviceHandlerTypes": [
    "class com.mulesoft.agent.domain.tracking.AgentTrackingNotification"
  ]
}

Modify the Current Configuration

To modify the current configuration during runtime, send a request with the JSON representation of the modified configuration. This representation overrides the current configuration. Any fields not included in the JSON representation retain their current values.

The following example request overrides the globalTrackingLevel and trackedApplications fields. All other fields remain unchanged.

Request:

PATCH <Runtime Manager Agent URL>/mule/agent/mule.agent.tracking.service HTTP/1.1

{
  "globalTrackingLevel": "BE",
  "trackedApplications": [
  {
    "appName": "mule-flights",
    "trackingLevel": "DEBUG",
    "trackedFlows": [
    {
      "flowName": "purchaseFlight",
      "trackingLevel": "TRACKING"
    }
    ]
  }
  ]
}

Response:

{
  "configurableFields": [
  {
    "name": "globalTrackingLevel",
    "valueType": "com.mulesoft.agent.services.tracking.TrackingLevel",
    "value": "BE",
    "configurableType": "DYNAMIC",
    "description": ""
    },
    {
      "name": "trackedApplications",
      "valueType": "[Lcom.mulesoft.agent.services.tracking.TrackedApplication;",
      "value": [
      {
        "appName": "mule-flights",
        "trackingLevel": "DEBUG",
        "trackedFlows": [
        {
          "flowName": "purchaseFlight",
          "trackingLevel": "TRACKING"
        }
        ]
      }
      ],
      "configurableType": "DYNAMIC",
      "description": ""
    }
    ],
    "injectedHandlers": [
    {
      "name": "com.mulesoft.agent.handlers.internal.InternalTrackingNotificationHandler",
      "path": "/mule/agent/tracking.notification.internal.message.handler/configuration",
      "type": "class com.mulesoft.agent.domain.tracking.AgentTrackingNotification"
    }
    ],
    "serviceHandlerTypes": [
    "class com.mulesoft.agent.domain.tracking.AgentTrackingNotification"
    ]
  }
The event tracking log file ($MULE_HOME/logs/events-%d{yyyy-dd-MM}-%i.log) is not automatically deleted. You must manually delete the logs periodically.

See Also