Alerting task cancellation hooks

[ymao1]

Summary

• Adds event log entry when task manager cancels alerting task

{
  "@timestamp" : "2021-09-09T13:38:02.287Z",
  "event" : {
    "provider" : "alerting",
    "action" : "cancelled",
    "kind" : "alert",
    "category" : [
      "AlertingExample"
    ]
  },
  "message" : "rule execution cancelled by task manager: \"69e65fb0-1164-11ec-b104-8d6e0d8799f7\"",
  "kibana" : {
    "saved_objects" : [
      {
        "rel" : "primary",
        "type" : "alert",
        "id" : "69e65fb0-1164-11ec-b104-8d6e0d8799f7",
        "type_id" : "example.always-firing"
      }
    ],
    "server_uuid" : "5b2de169-2785-441b-ae8c-186a1936b17d",
    "version" : "8.0.0"
  },
  "rule" : {
    "id" : "69e65fb0-1164-11ec-b104-8d6e0d8799f7",
    "license" : "basic",
    "category" : "example.always-firing",
    "ruleset" : "AlertingExample"
  },
  "ecs" : {
    "version" : "1.8.0"
  }
}

• Aborts any in progress query when task manager cancels a task. This will cause the rule execution to error and log [error][alerting][plugins] Executing Alert default:.es-query:cbe82b90-117c-11ec-89fc-392cf9341229 has resulted in Error: Request aborted
• Passes an executionIsCancelled function into the rule executor that rules can use to periodically check whether they should continue executing.
• Checks whether execution is cancelled before scheduling actions. If execution is cancelled, logs a message and doesn't schedule any actions.

[kibanamachine]

⏳ Build in-progress, with failures

• continuous-integration/kibana-ci/pull-request
• Commit: a50407b
• Storybooks not built yet
• This comment will update when the build is complete

Failed CI Steps

• Check Types and Public API Docs

History

• 💔 Build #152238 failed 9f843c3
• 💔 Build #152010 failed 3e18fed

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream