Configuring Custom Alert Scripts

You can configure the Alert Publisher to call a user-provided script in response to an alert.
Minimum Required Role: Limited Cluster Administrator (also provided by Full Administrator and Cluster Administrator)
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:
Save the script on the host where the Alert Publisher role is running.
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
```
Open the Cloudera Manager Admin console and select Clusters > Cloudera Management Service.
Click the Configuration tab.
Select Scope > Alert Publisher .
Enter the path to the script in the Custom Alert Script property.
Enter a Reason for change, and then click Save Changes to commit the changes.
A sample Python script is available that parses the alert file and sends alerts to different email addresses based on the content of the alert. See Sample Custom Alert Script.
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
  }
} ]