[role="xpack"]
[testenv="platinum"]
[[ml-get-snapshot]]
=== Get model snapshots API
++++
<titleabbrev>Get model snapshots</titleabbrev>
++++

Retrieves information about model snapshots.

[[ml-get-snapshot-request]]
==== {api-request-title}

`GET _ml/anomaly_detectors/<job_id>/model_snapshots` +

`GET _ml/anomaly_detectors/<job_id>/model_snapshots/<snapshot_id>`

[[ml-get-snapshot-prereqs]]
==== {api-prereq-title}

* If the {es} {security-features} are enabled, you must have `monitor_ml`,
`monitor`, `manage_ml`, or `manage` cluster privileges to use this API. See
<<security-privileges>>.

[[ml-get-snapshot-path-parms]]
==== {api-path-parms-title}

`<job_id>`::
(Required, string)
include::{docdir}/ml/ml-shared.asciidoc[tag=job-id-anomaly-detection]

`<snapshot_id>`::
(Optional, string)
include::{docdir}/ml/ml-shared.asciidoc[tag=snapshot-id]
+
--
If you do not specify this optional parameter, the API returns information about
all model snapshots.
--

[[ml-get-snapshot-request-body]]
==== {api-request-body-title}

`desc`::
  (Optional, boolean) If true, the results are sorted in descending order.

`end`::
  (Optional, date) Returns snapshots with timestamps earlier than this time.

`from`::
  (Optional, integer) Skips the specified number of snapshots.

`size`::
  (Optional, integer) Specifies the maximum number of snapshots to obtain.

`sort`::
  (Optional, string) Specifies the sort field for the requested snapshots. By
  default, the snapshots are sorted by their timestamp.

`start`::
  (Optional, string) Returns snapshots with timestamps after this time.

[[ml-get-snapshot-results]]
==== {api-response-body-title}

The API returns an array of model snapshot objects, which have the following
properties:

`description`::
(string) An optional description of the job.

`job_id`::
(string) A numerical character string that uniquely identifies the job that
the snapshot was created for.

`latest_record_time_stamp`::
(date) The timestamp of the latest processed record.

`latest_result_time_stamp`::
(date) The timestamp of the latest bucket result.

`min_version`::
(string) The minimum version required to be able to restore the model snapshot.

`model_size_stats`::
(object) Summary information describing the model.

`model_size_stats`.`bucket_allocation_failures_count`:::
(long) The number of buckets for which entities were not processed due to
memory limit constraints.

`model_size_stats`.`categorized_doc_count`:::
(long) The number of documents that have had a field categorized.

`model_size_stats`.`categorization_status`:::
(string) The status of categorization for this job.
Contains one of the following values.
+
--
* `ok`: Categorization is performing acceptably well (or not being
used at all).
* `warn`: Categorization is detecting a distribution of categories
that suggests the input data is inappropriate for categorization.
Problems could be that there is only one category, more than 90% of
categories are rare, the number of categories is greater than 50% of
the number of categorized documents, there are no frequently
matched categories, or more than 50% of categories are dead.

--

`model_size_stats`.`dead_category_count`:::
(long) The number of categories created by categorization that will
never be assigned again because another category's definition
makes it a superset of the dead category.  (Dead categories are a
side effect of the way categorization has no prior training.)

`model_size_stats`.`frequent_category_count`:::
(long) The number of categories that match more than 1% of categorized
documents.

`model_size_stats`.`job_id`:::
(string)
include::{docdir}/ml/ml-shared.asciidoc[tag=job-id-anomaly-detection]

`model_size_stats`.`log_time`:::
(date) The timestamp that the `model_size_stats` were recorded, according to
server-time.

`model_size_stats`.`memory_status`:::
(string) The status of the memory in relation to its `model_memory_limit`.
Contains one of the following values.
+
--
* `hard_limit`: The internal models require more space that the configured
memory limit. Some incoming data could not be processed.
* `ok`: The internal models stayed below the configured value.
* `soft_limit`: The internal models require more than 60% of the configured
memory limit and more aggressive pruning will be performed in order to try to
reclaim space.
--

`model_size_stats`.`model_bytes`:::
(long) An approximation of the memory resources required for this analysis.

`model_size_stats`.`model_bytes_exceeded`:::
(long) The number of bytes over the high limit for memory usage at the last allocation failure.

`model_size_stats`.`model_bytes_memory_limit`:::
(long) The upper limit for memory usage, checked on increasing values.

`model_size_stats`.`rare_category_count`:::
(long) The number of categories that match just one categorized document.

`model_size_stats`.`result_type`:::
(string) Internal. This value is always set to `model_size_stats`.

`model_size_stats`.`timestamp`:::
(date) The timestamp that the `model_size_stats` were recorded, according to
the bucket timestamp of the data.

`model_size_stats`.`total_by_field_count`:::
(long) The number of _by_ field values analyzed. Note that these are counted
separately for each detector and partition.

`model_size_stats`.`total_category_count`:::
(long) The number of categories created by categorization.

`model_size_stats`.`total_over_field_count`:::
(long) The number of _over_ field values analyzed. Note that these are counted
separately for each detector and partition.

`model_size_stats`.`total_partition_field_count`:::
(long) The number of _partition_ field values analyzed.

`retain`::
(boolean)
include::{docdir}/ml/ml-shared.asciidoc[tag=retain]

`snapshot_id`::
(string)
include::{docdir}/ml/ml-shared.asciidoc[tag=snapshot-id]

`snapshot_doc_count`::
(long) For internal use only.

`timestamp`::
(date) The creation timestamp for the snapshot.

[[ml-get-snapshot-example]]
==== {api-examples-title}

[source,console]
--------------------------------------------------
GET _ml/anomaly_detectors/high_sum_total_sales/model_snapshots
{
  "start": "1575402236000"
}
--------------------------------------------------
// TEST[skip:Kibana sample data]

In this example, the API provides a single result:
[source,js]
----
{
  "count" : 1,
  "model_snapshots" : [
    {
      "job_id" : "high_sum_total_sales",
      "min_version" : "6.4.0",
      "timestamp" : 1575402237000,
      "description" : "State persisted due to job close at 2019-12-03T19:43:57+0000",
      "snapshot_id" : "1575402237",
      "snapshot_doc_count" : 1,
      "model_size_stats" : {
        "job_id" : "high_sum_total_sales",
        "result_type" : "model_size_stats",
        "model_bytes" : 1638816,
        "model_bytes_exceeded" : 0,
        "model_bytes_memory_limit" : 10485760,
        "total_by_field_count" : 3,
        "total_over_field_count" : 3320,
        "total_partition_field_count" : 2,
        "bucket_allocation_failures_count" : 0,
        "memory_status" : "ok",
        "categorized_doc_count" : 0,
        "total_category_count" : 0,
        "frequent_category_count" : 0,
        "rare_category_count" : 0,
        "dead_category_count" : 0,
        "categorization_status" : "ok",
        "log_time" : 1575402237000,
        "timestamp" : 1576965600000
      },
      "latest_record_time_stamp" : 1576971072000,
      "latest_result_time_stamp" : 1576965600000,
      "retain" : false
    }
  ]
}
----
