195 lines
5.8 KiB
Plaintext
195 lines
5.8 KiB
Plaintext
[role="xpack"]
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[testenv="platinum"]
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[[ml-get-overall-buckets]]
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=== Get overall buckets API
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++++
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<titleabbrev>Get overall buckets</titleabbrev>
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++++
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Retrieves overall bucket results that summarize the bucket results of multiple
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{anomaly-jobs}.
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[[ml-get-overall-buckets-request]]
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==== {api-request-title}
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`GET _ml/anomaly_detectors/<job_id>/results/overall_buckets` +
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`GET _ml/anomaly_detectors/<job_id>,<job_id>/results/overall_buckets` +
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`GET _ml/anomaly_detectors/_all/results/overall_buckets`
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[[ml-get-overall-buckets-prereqs]]
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==== {api-prereq-title}
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* If the {es} {security-features} are enabled, you must have `monitor_ml`,
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`monitor`, `manage_ml`, or `manage` cluster privileges to use this API. You also
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need `read` index privilege on the index that stores the results. The
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`machine_learning_admin` and `machine_learning_user` roles provide these
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privileges. See <<security-privileges>> and <<built-in-roles>>.
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[[ml-get-overall-buckets-desc]]
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==== {api-description-title}
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You can summarize the bucket results for all {anomaly-jobs} by using `_all` or
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by specifying `*` as the `<job_id>`.
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By default, an overall bucket has a span equal to the largest bucket span of the
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specified {anomaly-jobs}. To override that behavior, use the optional
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`bucket_span` parameter. To learn more about the concept of buckets, see
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{stack-ov}/ml-buckets.html[Buckets].
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The `overall_score` is calculated by combining the scores of all the buckets
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within the overall bucket span. First, the maximum `anomaly_score` per
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{anomaly-job} in the overall bucket is calculated. Then the `top_n` of those
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scores are averaged to result in the `overall_score`. This means that you can
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fine-tune the `overall_score` so that it is more or less sensitive to the number
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of jobs that detect an anomaly at the same time. For example, if you set `top_n`
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to `1`, the `overall_score` is the maximum bucket score in the overall bucket.
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Alternatively, if you set `top_n` to the number of jobs, the `overall_score` is
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high only when all jobs detect anomalies in that overall bucket. If you set
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the `bucket_span` parameter (to a value greater than its default), the
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`overall_score` is the maximum `overall_score` of the overall buckets that have
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a span equal to the jobs' largest bucket span.
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[[ml-get-overall-buckets-path-parms]]
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==== {api-path-parms-title}
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`<job_id>`::
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(Required, string) Identifier for the {anomaly-job}. It can be a job
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identifier, a group name, a comma-separated list of jobs or groups, or a
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wildcard expression.
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[[ml-get-overall-buckets-request-body]]
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==== {api-request-body-title}
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`allow_no_jobs`::
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(Optional, boolean) If `false` and the `job_id` does not match any
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{anomaly-jobs}, an error occurs. The default value is `true`.
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`bucket_span`::
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(Optional, string) The span of the overall buckets. Must be greater or equal
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to the largest bucket span of the specified {anomaly-jobs}, which is the
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default value.
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`end`::
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(Optional, string) Returns overall buckets with timestamps earlier than this
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time.
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`exclude_interim`::
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(Optional, boolean) If `true`, the output excludes interim overall buckets.
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Overall buckets are interim if any of the job buckets within the overall
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bucket interval are interim. By default, interim results are included.
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`overall_score`::
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(Optional, double) Returns overall buckets with overall scores greater or
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equal than this value.
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`start`::
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(Optional, string) Returns overall buckets with timestamps after this time.
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`top_n`::
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(Optional, integer) The number of top {anomaly-job} bucket scores to be used
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in the `overall_score` calculation. The default value is `1`.
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[[ml-get-overall-buckets-results]]
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==== {api-response-body-title}
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The API returns the following information:
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`overall_buckets`::
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(array) An array of overall bucket objects. For more information, see
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<<ml-results-overall-buckets,Overall Buckets>>.
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[[ml-get-overall-buckets-example]]
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==== {api-examples-title}
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The following example gets overall buckets for {anomaly-jobs} with IDs matching
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`job-*`:
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[source,console]
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--------------------------------------------------
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GET _ml/anomaly_detectors/job-*/results/overall_buckets
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{
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"overall_score": 80,
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"start": "1403532000000"
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}
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--------------------------------------------------
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// TEST[skip:todo]
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In this example, the API returns a single result that matches the specified
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score and time constraints. The `overall_score` is the max job score as
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`top_n` defaults to 1 when not specified:
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[source,js]
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----
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{
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"count": 1,
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"overall_buckets": [
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{
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"timestamp" : 1403532000000,
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"bucket_span" : 3600,
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"overall_score" : 80.0,
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"jobs" : [
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{
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"job_id" : "job-1",
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"max_anomaly_score" : 30.0
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},
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{
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"job_id" : "job-2",
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"max_anomaly_score" : 10.0
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},
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{
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"job_id" : "job-3",
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"max_anomaly_score" : 80.0
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}
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],
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"is_interim" : false,
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"result_type" : "overall_bucket"
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}
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]
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}
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----
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The next example is similar but this time `top_n` is set to `2`:
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[source,console]
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--------------------------------------------------
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GET _ml/anomaly_detectors/job-*/results/overall_buckets
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{
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"top_n": 2,
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"overall_score": 50.0,
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"start": "1403532000000"
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}
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--------------------------------------------------
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// TEST[skip:todo]
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Note how the `overall_score` is now the average of the top 2 job scores:
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[source,js]
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----
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{
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"count": 1,
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"overall_buckets": [
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{
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"timestamp" : 1403532000000,
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"bucket_span" : 3600,
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"overall_score" : 55.0,
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"jobs" : [
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{
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"job_id" : "job-1",
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"max_anomaly_score" : 30.0
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},
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{
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"job_id" : "job-2",
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"max_anomaly_score" : 10.0
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},
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{
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"job_id" : "job-3",
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"max_anomaly_score" : 80.0
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}
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],
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"is_interim" : false,
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"result_type" : "overall_bucket"
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}
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]
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}
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----
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