OpenSearch/docs/reference/monitoring/collecting-monitoring-data.asciidoc

[role="xpack"]
[testenv="gold"]
[[collecting-monitoring-data]]
== Collecting monitoring data

If you enable the Elastic {monitor-features} in your cluster, you can 
optionally collect metrics about {es}. By default, monitoring is enabled but 
data collection is disabled. 

This method involves sending the metrics to the monitoring cluster by using 
exporters. For an alternative method, see <<configuring-metricbeat>>.

NOTE: If you want to collect monitoring data from sources such as Beats and {ls}
and route it to a monitoring cluster, you must follow this method. You cannot
use {metricbeat} to ship the monitoring data for those products yet.

Advanced monitoring settings enable you to control how frequently data is 
collected, configure timeouts, and set the retention period for locally-stored 
monitoring indices. You can also adjust how monitoring data is displayed. 

To learn about monitoring in general, see <<monitor-elasticsearch-cluster>>. 

. Configure your cluster to collect monitoring data:

.. Verify that the `xpack.monitoring.enabled` setting is `true`, which is its 
default value, on each node in the cluster. For more information, see 
<<monitoring-settings>>. 

.. Verify that the `xpack.monitoring.elasticsearch.collection.enabled` setting 
is `true`, which is its default value, on each node in the cluster. 
+
--
NOTE: You can specify this setting in either the `elasticsearch.yml` on each 
node or across the cluster as a dynamic cluster setting. If {es} 
{security-features} are enabled, you must have `monitor` cluster privileges to 
view the cluster settings and `manage` cluster privileges to change them.

For more information, see <<monitoring-settings>> and <<cluster-update-settings>>.
--

.. Set the `xpack.monitoring.collection.enabled` setting to `true` on each
node in the cluster. By default, it is is disabled (`false`). 
+ 
--
NOTE: You can specify this setting in either the `elasticsearch.yml` on each 
node or across the cluster as a dynamic cluster setting. If {es} 
{security-features} are enabled, you must have `monitor` cluster privileges to 
view the cluster settings and `manage` cluster privileges to change them.

For example, use the following APIs to review and change this setting:

[source,console]
----------------------------------
GET _cluster/settings

PUT _cluster/settings
{
  "persistent": {
    "xpack.monitoring.collection.enabled": true
  }
}
----------------------------------

Alternatively, you can enable this setting in {kib}. In the side navigation, 
click *Monitoring*. If data collection is disabled, you are prompted to turn it 
on. 

For more 
information, see <<monitoring-settings>> and <<cluster-update-settings>>.
--

.. Optional: Specify which indices you want to monitor. 
+
--
By default, the monitoring agent collects data from all {es} indices.
To collect data from particular indices, configure the
`xpack.monitoring.collection.indices` setting. You can specify multiple indices 
as a comma-separated list or use an index pattern to match multiple indices. For 
example:

[source,yaml]
----------------------------------
xpack.monitoring.collection.indices: logstash-*, index1, test2
----------------------------------

You can prepend `-` to explicitly exclude index names or
patterns. For example, to include all indices that start with `test` except 
`test3`, you could specify `test*,-test3`. To include system indices such as
.security and .kibana, add `.*` to the list of included names.
For example `.*,test*,-test3`
--

.. Optional: Specify how often to collect monitoring data. The default value for 
the `xpack.monitoring.collection.interval` setting 10 seconds. See 
<<monitoring-settings>>.

. Identify where to store monitoring data. 
+
--
By default, the data is stored on the same cluster by using a 
<<local-exporter,`local` exporter>>. Alternatively, you can use an <<http-exporter,`http` exporter>> to send data to 
a separate _monitoring cluster_. 

IMPORTANT: The {es} {monitor-features} use ingest pipelines, therefore the
cluster that stores the monitoring data must have at least one 
<<ingest,ingest node>>. 

For more information about typical monitoring architectures, 
see <<how-monitoring-works>>.
--

. If you choose to use an `http` exporter: 

.. On the cluster that you want to monitor (often called the _production cluster_), 
configure each node to send metrics to your monitoring cluster. Configure an 
HTTP exporter in the `xpack.monitoring.exporters` settings in the 
`elasticsearch.yml` file. For example:
+
--
[source,yaml]
--------------------------------------------------
xpack.monitoring.exporters:
  id1:
    type: http
    host: ["http://es-mon-1:9200", "http://es-mon2:9200"] 
--------------------------------------------------
--

.. If the Elastic {security-features} are enabled on the monitoring cluster, you 
must provide appropriate credentials when data is shipped to the monitoring cluster:

... Create a user on the monitoring cluster that has the 
<<built-in-roles,`remote_monitoring_agent` built-in role>>. 
Alternatively, use the 
<<built-in-users,`remote_monitoring_user` built-in user>>.

... Add the user ID and password settings to the HTTP exporter settings in the 
`elasticsearch.yml` file on each node. +
+
--
For example:

[source,yaml]
--------------------------------------------------
xpack.monitoring.exporters:
  id1:
    type: http
    host: ["http://es-mon-1:9200", "http://es-mon2:9200"] 
    auth.username: remote_monitoring_user 
    auth.password: YOUR_PASSWORD
--------------------------------------------------
--

.. If you configured the monitoring cluster to use 
<<configuring-tls,encrypted communications>>, you must use the HTTPS protocol in 
the `host` setting. You must also specify the trusted CA certificates that will 
be used to verify the identity of the nodes in the monitoring cluster. 

*** To add a CA certificate to an {es} node's trusted certificates, you can 
specify the location of the PEM encoded certificate with the 
`certificate_authorities` setting. For example:
+
--
[source,yaml]
--------------------------------------------------
xpack.monitoring.exporters:
  id1:
    type: http
    host: ["https://es-mon1:9200", "https://es-mon2:9200"] 
    auth:
      username: remote_monitoring_user
      password: YOUR_PASSWORD
    ssl:
      certificate_authorities: [ "/path/to/ca.crt" ]
--------------------------------------------------
--

*** Alternatively, you can configure trusted certificates using a truststore
(a Java Keystore file that contains the certificates). For example:
+
--
[source,yaml]
--------------------------------------------------
xpack.monitoring.exporters:
  id1:
    type: http
    host: ["https://es-mon1:9200", "https://es-mon2:9200"]
    auth:
      username: remote_monitoring_user
      password: YOUR_PASSWORD
    ssl:
      truststore.path: /path/to/file
      truststore.password: password
--------------------------------------------------
--

. Configure your cluster to route monitoring data from sources such as {kib}, 
Beats, and {ls} to the monitoring cluster. For information about configuring
each product to collect and send monitoring data, see <<monitor-elasticsearch-cluster>>.

. If you updated settings in the `elasticsearch.yml` files on your production 
cluster, restart {es}. See <<stopping-elasticsearch>> and <<starting-elasticsearch>>. 
+
--
TIP: You may want to temporarily {ref}/modules-cluster.html[disable shard
allocation] before you restart your nodes to avoid unnecessary shard
reallocation during the install process.

--

. Optional: 
<<config-monitoring-indices,Configure the indices that store the monitoring data>>. 

. {kibana-ref}/monitoring-data.html[View the monitoring data in {kib}].