Put watch API | ElasticSearch 7.7 权威指南中文版

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Put watch APIedit

Either registers a new watch in Watcher or updates an existing one.

Requestedit

PUT _watcher/watch/<watch_id>

Prerequisitesedit

You must have manage_watcher cluster privileges to use this API. For more information, see Security privileges.

Descriptionedit

When a watch is registered, a new document that represents the watch is added to the .watches index and its trigger is immediately registered with the relevant trigger engine. Typically for the schedule trigger, the scheduler is the trigger engine.

You must use Kibana or this API to create a watch. Do not put a watch directly to the .watches index using the Elasticsearch index API. If Elasticsearch security features are enabled, do not give users write privileges on the .watches index.

When adding a watch you can also define its initial active state. You do that by setting the active parameter.

Security integrationedit

When Elasticsearch security features are enabled, your watch can index or search only on indices for which the user that stored the watch has privileges. If the user is able to read index a, but not index b, the same will apply, when the watch is executed.

Path parametersedit

<watch_id>: (Required, string) Identifier for the watch.

Query parametersedit

active: (Optional, boolean) Defines whether the watch is active or inactive by default. The default value is true, which means the watch is active by default.

Request bodyedit

A watch has the following fields:

Name	Description
`trigger`	The trigger that defines when the watch should run.
`input`	The input that defines the input that loads the data for the watch.
`condition`	The condition that defines if the actions should be run.
`actions`	The list of actions that will be run if the condition matches
`metadata`	Metadata json that will be copied into the history entries.
`throttle_period`	The minimum time between actions being run, the default for this is 5 seconds. This default can be changed in the config file with the setting `xpack.watcher.throttle.period.default_period`. If both this value and the `throttle_period_in_millis` parameter are specified, Watcher uses the last parameter included in the request.
`throttle_period_in_millis`	Minimum time in milliseconds between actions being run. Defaults to `5000`. If both this value and the `throttle_period` parameter are specified, Watcher uses the last parameter included in the request.

Examplesedit

The following example adds a watch with the my-watch id that has the following characteristics:

The watch schedule triggers every minute.
The watch search input looks for any 404 HTTP responses that occurred in the last five minutes.
The watch condition checks if any search hits where found.
When found, the watch action sends an email to an administrator.

PUT _watcher/watch/my-watch
{
  "trigger" : {
    "schedule" : { "cron" : "0 0/1 * * * ?" }
  },
  "input" : {
    "search" : {
      "request" : {
        "indices" : [
          "logstash*"
        ],
        "body" : {
          "query" : {
            "bool" : {
              "must" : {
                "match": {
                   "response": 404
                }
              },
              "filter" : {
                "range": {
                  "@timestamp": {
                    "from": "{{ctx.trigger.scheduled_time}}||-5m",
                    "to": "{{ctx.trigger.triggered_time}}"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "condition" : {
    "compare" : { "ctx.payload.hits.total" : { "gt" : 0 }}
  },
  "actions" : {
    "email_admin" : {
      "email" : {
        "to" : "admin@domain.host.com",
        "subject" : "404 recently encountered"
      }
    }
  }
}

When you add a watch you can also define its initial active state. You do that by setting the active parameter. The following command adds a watch and sets it to be inactive by default:

PUT _watcher/watch/my-watch?active=false

If you omit the active parameter, the watch is active by default.

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