Configuring Custom Alert Scripts

Minimum Required Role: Full Administrator. This feature is not available when using Cloudera Manager to manage Data Hub clusters.

You can configure the Alert Publisher to run a user-written script in response to an alert. The Alert Publisher passes a single argument to the script that is a UTF-8 JSON file containing a list of alerts. The script runs on the host where the Alert Publisher service is running and must have read and execute permissions for the cloudera-scm user. Only one instance of a script runs at a time. The standard out and standard error messages from the script are logged to the Alert Publisher log file.

You use the Alert Publisher: Maximum Batch Size and Alert Publisher: Maximum Batch interval to configure when the Alert Publisher delivers alerts.

To configure the Alert Publisher to deliver alerts using a script:
  1. Save the script on the host where the Alert Publisher role is running.
  2. Change the owner of the file to cloudera-scm and set its permissions to read and execute:
    sudo chown cloudera-scm:cloudera-scm path_to_script
    sudo chmod u+rx path_to_script
  3. Open the Cloudera Manager Admin console and select Clusters > Cloudera Management Service.
  4. Click the Configuration tab.
  5. Select Scope > Alert Publisher .
  6. Enter the path to the script in the Custom Alert Script property.
  7. Enter a Reason for change, and then click Save Changes to commit the changes.

Sample JSON Alert File

When a custom script runs, it passes a JSON file that contains the alerts. For example:
[ {
  "body" : {
    "alert" : {
      "content" : "The health test result for MAPREDUCE_HA_JOB_TRACKER_HEALTH has become bad: JobTracker summary: myCluster.com (Availability: Active, Health: Bad). This health test reflects the health of the active JobTracker.",
      "timestamp" : {
        "iso8601" : "2015-06-11T03:52:56Z",
        "epochMs" : 1433994776083
      },
      "source" : "http://myCluster.com:7180/cmf/eventRedirect/89521139-0859-4bef-bf65-eb141e63dbba",
      "attributes" : {
        "__persist_timestamp" : [ "1433994776172" ],
        "ALERT_SUPPRESSED" : [ "false" ],
        "HEALTH_TEST_NAME" : [ "MAPREDUCE_HA_JOB_TRACKER_HEALTH" ],
        "SEVERITY" : [ "CRITICAL" ],
        "HEALTH_TEST_RESULTS" : [ {
          "content" : "The health test result for MAPREDUCE_HA_JOB_TRACKER_HEALTH has become bad: JobTracker summary: myCluster.com (Availability: Active, Health: Bad). This health test reflects the health of the active JobTracker.",
          "testName" : "MAPREDUCE_HA_JOB_TRACKER_HEALTH",
          "eventCode" : "EV_SERVICE_HEALTH_CHECK_BAD",
          "severity" : "CRITICAL"
        } ],
        "CLUSTER_DISPLAY_NAME" : [ "Cluster 1" ],
        "ALERT" : [ "true" ],
        "CATEGORY" : [ "HEALTH_CHECK" ],
        "BAD_TEST_RESULTS" : [ "1" ],
        "SERVICE_TYPE" : [ "MAPREDUCE" ],
        "EVENTCODE" : [ "EV_SERVICE_HEALTH_CHECK_BAD", "EV_SERVICE_HEALTH_CHECK_GOOD" ],
        "ALERT_SUMMARY" : [ "The health of service MAPREDUCE-1 has become bad." ],
        "CLUSTER_ID" : [ "1" ],
        "SERVICE" : [ "MAPREDUCE-1" ],
        "__uuid" : [ "89521139-0859-4bef-bf65-eb141e63dbba" ],
        "CLUSTER" : [ "Cluster 1" ],
        "CURRENT_COMPLETE_HEALTH_TEST_RESULTS" : [ "{\"content\":\"The health test result for MAPREDUCE_HA_JOB_TRACKER_HEALTH has become bad: JobTracker summary: myCluster.com (Availability: Active, Health: Bad). This health test reflects the health of the active JobTracker.\",\"testName\":\"MAPREDUCE_HA_JOB_TRACKER_HEALTH\",\"eventCode\":\"EV_SERVICE_HEALTH_CHECK_BAD\",\"severity\":\"CRITICAL\"}", "{\"content\":\"The health test result for MAPREDUCE_TASK_TRACKERS_HEALTHY has become good: Healthy TaskTracker: 3. Concerning TaskTracker: 0. Total TaskTracker: 3. Percent healthy: 100.00%. Percent healthy or concerning: 100.00%.\",\"testName\":\"MAPREDUCE_TASK_TRACKERS_HEALTHY\",\"eventCode\":\"EV_SERVICE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}" ],
        "PREVIOUS_HEALTH_SUMMARY" : [ "GREEN" ],
        "CURRENT_HEALTH_SUMMARY" : [ "RED" ],
        "MONITOR_STARTUP" : [ "false" ],
        "PREVIOUS_COMPLETE_HEALTH_TEST_RESULTS" : [ "{\"content\":\"The health test result for MAPREDUCE_HA_JOB_TRACKER_HEALTH has become good: JobTracker summary: myCluster.com (Availability: Active, Health: Good)\",\"testName\":\"MAPREDUCE_HA_JOB_TRACKER_HEALTH\",\"eventCode\":\"EV_SERVICE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for MAPREDUCE_TASK_TRACKERS_HEALTHY has become good: Healthy TaskTracker: 3. Concerning TaskTracker: 0. Total TaskTracker: 3. Percent healthy: 100.00%. Percent healthy or concerning: 100.00%.\",\"testName\":\"MAPREDUCE_TASK_TRACKERS_HEALTHY\",\"eventCode\":\"EV_SERVICE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}" ],
        "SERVICE_DISPLAY_NAME" : [ "MAPREDUCE-1" ]
      }
    }
  },
  "header" : {
    "type" : "alert",
    "version" : 2
  }
}, {
  "body" : {
    "alert" : {
      "content" : "The health test result for JOB_TRACKER_SCM_HEALTH has become bad: This role's process exited. This role is supposed to be started.",
      "timestamp" : {
        "iso8601" : "2015-06-11T03:52:56Z",
        "epochMs" : 1433994776083
      },
      "source" : "http://myCluster.com:7180/cmf/eventRedirect/67b4d1c4-791b-428e-a9ea-8a09d4885f5d",
      "attributes" : {
        "__persist_timestamp" : [ "1433994776173" ],
        "ALERT_SUPPRESSED" : [ "false" ],
        "HEALTH_TEST_NAME" : [ "JOB_TRACKER_SCM_HEALTH" ],
        "SEVERITY" : [ "CRITICAL" ],
        "ROLE" : [ "MAPREDUCE-1-JOBTRACKER-10624c438dee9f17211d3f33fa899957" ],
        "HEALTH_TEST_RESULTS" : [ {
          "content" : "The health test result for JOB_TRACKER_SCM_HEALTH has become bad: This role's process exited. This role is supposed to be started.",
          "testName" : "JOB_TRACKER_SCM_HEALTH",
          "eventCode" : "EV_ROLE_HEALTH_CHECK_BAD",
          "severity" : "CRITICAL"
        } ],
        "CLUSTER_DISPLAY_NAME" : [ "Cluster 1" ],
        "HOST_IDS" : [ "75e763c2-8d22-47a1-8c80-501751ae0db7" ],
        "ALERT" : [ "true" ],
        "ROLE_TYPE" : [ "JOBTRACKER" ],
        "CATEGORY" : [ "HEALTH_CHECK" ],
        "BAD_TEST_RESULTS" : [ "1" ],
        "SERVICE_TYPE" : [ "MAPREDUCE" ],
        "EVENTCODE" : [ "EV_ROLE_HEALTH_CHECK_BAD", "EV_ROLE_HEALTH_CHECK_GOOD", "EV_ROLE_HEALTH_CHECK_DISABLED" ],
        "ALERT_SUMMARY" : [ "The health of role jobtracker (nightly-1) has become bad." ],
        "CLUSTER_ID" : [ "1" ],
        "SERVICE" : [ "MAPREDUCE-1" ],
        "__uuid" : [ "67b4d1c4-791b-428e-a9ea-8a09d4885f5d" ],
        "CLUSTER" : [ "Cluster 1" ],
        "CURRENT_COMPLETE_HEALTH_TEST_RESULTS" : [ "{\"content\":\"The health test result for JOB_TRACKER_SCM_HEALTH has become bad: This role's process exited. This role is supposed to be started.\",\"testName\":\"JOB_TRACKER_SCM_HEALTH\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_BAD\",\"severity\":\"CRITICAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_UNEXPECTED_EXITS has become good: This role encountered 0 unexpected exit(s) in the previous 5 minute(s).\",\"testName\":\"JOB_TRACKER_UNEXPECTED_EXITS\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_FILE_DESCRIPTOR has become good: Open file descriptors: 244. File descriptor limit: 32,768. Percentage in use: 0.74%.\",\"testName\":\"JOB_TRACKER_FILE_DESCRIPTOR\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_SWAP_MEMORY_USAGE has become good: 0 B of swap memory is being used by this role's process.\",\"testName\":\"JOB_TRACKER_SWAP_MEMORY_USAGE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_LOG_DIRECTORY_FREE_SPACE has become good: This role's Log Directory (/var/log/hadoop-0.20-mapreduce) is on a filesystem with more than 20.00% of its space free.\",\"testName\":\"JOB_TRACKER_LOG_DIRECTORY_FREE_SPACE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_HOST_HEALTH has become good: The health of this role's host is good.\",\"testName\":\"JOB_TRACKER_HOST_HEALTH\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_WEB_METRIC_COLLECTION has become good: The web server of this role is responding with metrics. The most recent collection took 49 millisecond(s).\",\"testName\":\"JOB_TRACKER_WEB_METRIC_COLLECTION\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_GC_DURATION has become good: Average time spent in garbage collection was 0 second(s) (0.00%) per minute over the previous 5 minute(s).\",\"testName\":\"JOB_TRACKER_GC_DURATION\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_HEAP_DUMP_DIRECTORY_FREE_SPACE has become disabled: Test disabled because role is not configured to dump heap when out of memory. Test of whether this role's heap dump directory has enough free space.\",\"testName\":\"JOB_TRACKER_HEAP_DUMP_DIRECTORY_FREE_SPACE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_DISABLED\",\"severity\":\"INFORMATIONAL\"}" ],
        "CURRENT_HEALTH_SUMMARY" : [ "RED" ],
        "PREVIOUS_HEALTH_SUMMARY" : [ "GREEN" ],
        "MONITOR_STARTUP" : [ "false" ],
        "ROLE_DISPLAY_NAME" : [ "jobtracker (nightly-1)" ],
        "PREVIOUS_COMPLETE_HEALTH_TEST_RESULTS" : [ "{\"content\":\"The health test result for JOB_TRACKER_SCM_HEALTH has become good: This role's status is as expected. The role is started.\",\"testName\":\"JOB_TRACKER_SCM_HEALTH\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_UNEXPECTED_EXITS has become good: This role encountered 0 unexpected exit(s) in the previous 5 minute(s).\",\"testName\":\"JOB_TRACKER_UNEXPECTED_EXITS\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_FILE_DESCRIPTOR has become good: Open file descriptors: 244. File descriptor limit: 32,768. Percentage in use: 0.74%.\",\"testName\":\"JOB_TRACKER_FILE_DESCRIPTOR\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_SWAP_MEMORY_USAGE has become good: 0 B of swap memory is being used by this role's process.\",\"testName\":\"JOB_TRACKER_SWAP_MEMORY_USAGE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_LOG_DIRECTORY_FREE_SPACE has become good: This role's Log Directory (/var/log/hadoop-0.20-mapreduce) is on a filesystem with more than 20.00% of its space free.\",\"testName\":\"JOB_TRACKER_LOG_DIRECTORY_FREE_SPACE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_HOST_HEALTH has become good: The health of this role's host is good.\",\"testName\":\"JOB_TRACKER_HOST_HEALTH\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_WEB_METRIC_COLLECTION has become good: The web server of this role is responding with metrics. The most recent collection took 49 millisecond(s).\",\"testName\":\"JOB_TRACKER_WEB_METRIC_COLLECTION\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_GC_DURATION has become good: Average time spent in garbage collection was 0 second(s) (0.00%) per minute over the previous 5 minute(s).\",\"testName\":\"JOB_TRACKER_GC_DURATION\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_HEAP_DUMP_DIRECTORY_FREE_SPACE has become disabled: Test disabled because role is not configured to dump heap when out of memory. Test of whether this role's heap dump directory has enough free space.\",\"testName\":\"JOB_TRACKER_HEAP_DUMP_DIRECTORY_FREE_SPACE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_DISABLED\",\"severity\":\"INFORMATIONAL\"}" ],
        "SERVICE_DISPLAY_NAME" : [ "MAPREDUCE-1" ],
        "HOSTS" : [ "myCluster.com" ]
      }
    }
  },
  "header" : {
    "type" : "alert",
    "version" : 2
  }
}, {
  "body" : {
    "alert" : {
      "content" : "The health test result for JOB_TRACKER_UNEXPECTED_EXITS has become bad: This role encountered 1 unexpected exit(s) in the previous 5 minute(s).This included 1 exit(s) due to OutOfMemory errors. Critical threshold: any.",
      "timestamp" : {
        "iso8601" : "2015-06-11T03:53:41Z",
        "epochMs" : 1433994821940
      },
      "source" : "http://myCluster.com:7180/cmf/eventRedirect/b8c4468d-08c2-4b5b-9bda-2bef892ba3f5",
      "attributes" : {
        "__persist_timestamp" : [ "1433994822027" ],
        "ALERT_SUPPRESSED" : [ "false" ],
        "HEALTH_TEST_NAME" : [ "JOB_TRACKER_UNEXPECTED_EXITS" ],
        "SEVERITY" : [ "CRITICAL" ],
        "ROLE" : [ "MAPREDUCE-1-JOBTRACKER-10624c438dee9f17211d3f33fa899957" ],
        "HEALTH_TEST_RESULTS" : [ {
          "content" : "The health test result for JOB_TRACKER_UNEXPECTED_EXITS has become bad: This role encountered 1 unexpected exit(s) in the previous 5 minute(s).This included 1 exit(s) due to OutOfMemory errors. Critical threshold: any.",
          "testName" : "JOB_TRACKER_UNEXPECTED_EXITS",
          "eventCode" : "EV_ROLE_HEALTH_CHECK_BAD",
          "severity" : "CRITICAL"
        } ],
        "CLUSTER_DISPLAY_NAME" : [ "Cluster 1" ],
        "HOST_IDS" : [ "75e763c2-8d22-47a1-8c80-501751ae0db7" ],
        "ALERT" : [ "true" ],
        "ROLE_TYPE" : [ "JOBTRACKER" ],
        "CATEGORY" : [ "HEALTH_CHECK" ],
        "BAD_TEST_RESULTS" : [ "1" ],
        "SERVICE_TYPE" : [ "MAPREDUCE" ],
        "EVENTCODE" : [ "EV_ROLE_HEALTH_CHECK_BAD", "EV_ROLE_HEALTH_CHECK_GOOD", "EV_ROLE_HEALTH_CHECK_DISABLED" ],
        "ALERT_SUMMARY" : [ "The health of role jobtracker (nightly-1) has become bad." ],
        "CLUSTER_ID" : [ "1" ],
        "SERVICE" : [ "MAPREDUCE-1" ],
        "__uuid" : [ "b8c4468d-08c2-4b5b-9bda-2bef892ba3f5" ],
        "CLUSTER" : [ "Cluster 1" ],
        "CURRENT_COMPLETE_HEALTH_TEST_RESULTS" : [ "{\"content\":\"The health test result for JOB_TRACKER_SCM_HEALTH has become bad: This role's process exited. This role is supposed to be started.\",\"testName\":\"JOB_TRACKER_SCM_HEALTH\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_BAD\",\"severity\":\"CRITICAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_UNEXPECTED_EXITS has become bad: This role encountered 1 unexpected exit(s) in the previous 5 minute(s).This included 1 exit(s) due to OutOfMemory errors. Critical threshold: any.\",\"testName\":\"JOB_TRACKER_UNEXPECTED_EXITS\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_BAD\",\"severity\":\"CRITICAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_FILE_DESCRIPTOR has become good: Open file descriptors: 244. File descriptor limit: 32,768. Percentage in use: 0.74%.\",\"testName\":\"JOB_TRACKER_FILE_DESCRIPTOR\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_SWAP_MEMORY_USAGE has become good: 0 B of swap memory is being used by this role's process.\",\"testName\":\"JOB_TRACKER_SWAP_MEMORY_USAGE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_LOG_DIRECTORY_FREE_SPACE has become good: This role's Log Directory (/var/log/hadoop-0.20-mapreduce) is on a filesystem with more than 20.00% of its space free.\",\"testName\":\"JOB_TRACKER_LOG_DIRECTORY_FREE_SPACE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_HOST_HEALTH has become good: The health of this role's host is good.\",\"testName\":\"JOB_TRACKER_HOST_HEALTH\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_WEB_METRIC_COLLECTION has become good: The web server of this role is responding with metrics. The most recent collection took 49 millisecond(s).\",\"testName\":\"JOB_TRACKER_WEB_METRIC_COLLECTION\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_GC_DURATION has become good: Average time spent in garbage collection was 0 second(s) (0.00%) per minute over the previous 5 minute(s).\",\"testName\":\"JOB_TRACKER_GC_DURATION\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_HEAP_DUMP_DIRECTORY_FREE_SPACE has become disabled: Test disabled because role is not configured to dump heap when out of memory. Test of whether this role's heap dump directory has enough free space.\",\"testName\":\"JOB_TRACKER_HEAP_DUMP_DIRECTORY_FREE_SPACE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_DISABLED\",\"severity\":\"INFORMATIONAL\"}" ],
        "CURRENT_HEALTH_SUMMARY" : [ "RED" ],
        "PREVIOUS_HEALTH_SUMMARY" : [ "RED" ],
        "MONITOR_STARTUP" : [ "false" ],
        "ROLE_DISPLAY_NAME" : [ "jobtracker (nightly-1)" ],
        "PREVIOUS_COMPLETE_HEALTH_TEST_RESULTS" : [ "{\"content\":\"The health test result for JOB_TRACKER_SCM_HEALTH has become bad: This role's process exited. This role is supposed to be started.\",\"testName\":\"JOB_TRACKER_SCM_HEALTH\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_BAD\",\"severity\":\"CRITICAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_UNEXPECTED_EXITS has become good: This role encountered 0 unexpected exit(s) in the previous 5 minute(s).\",\"testName\":\"JOB_TRACKER_UNEXPECTED_EXITS\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_FILE_DESCRIPTOR has become good: Open file descriptors: 244. File descriptor limit: 32,768. Percentage in use: 0.74%.\",\"testName\":\"JOB_TRACKER_FILE_DESCRIPTOR\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_SWAP_MEMORY_USAGE has become good: 0 B of swap memory is being used by this role's process.\",\"testName\":\"JOB_TRACKER_SWAP_MEMORY_USAGE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_LOG_DIRECTORY_FREE_SPACE has become good: This role's Log Directory (/var/log/hadoop-0.20-mapreduce) is on a filesystem with more than 20.00% of its space free.\",\"testName\":\"JOB_TRACKER_LOG_DIRECTORY_FREE_SPACE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_HOST_HEALTH has become good: The health of this role's host is good.\",\"testName\":\"JOB_TRACKER_HOST_HEALTH\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_WEB_METRIC_COLLECTION has become good: The web server of this role is responding with metrics. The most recent collection took 49 millisecond(s).\",\"testName\":\"JOB_TRACKER_WEB_METRIC_COLLECTION\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_GC_DURATION has become good: Average time spent in garbage collection was 0 second(s) (0.00%) per minute over the previous 5 minute(s).\",\"testName\":\"JOB_TRACKER_GC_DURATION\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_GOOD\",\"severity\":\"INFORMATIONAL\"}", "{\"content\":\"The health test result for JOB_TRACKER_HEAP_DUMP_DIRECTORY_FREE_SPACE has become disabled: Test disabled because role is not configured to dump heap when out of memory. Test of whether this role's heap dump directory has enough free space.\",\"testName\":\"JOB_TRACKER_HEAP_DUMP_DIRECTORY_FREE_SPACE\",\"eventCode\":\"EV_ROLE_HEALTH_CHECK_DISABLED\",\"severity\":\"INFORMATIONAL\"}" ],
        "SERVICE_DISPLAY_NAME" : [ "MAPREDUCE-1" ],
        "HOSTS" : [ "myCluster.com" ]
      }
    }
  },
  "header" : {
    "type" : "alert",
    "version" : 2
  }
} ]