# Alarm Correlation

This section describes how to configure Meridian to provide real-time feedback on alarm correlation.

## Situation Feedback

Situation feedback lets operators provide real-time feedback on alarm correlation.

### Installation

Enable situation feedback by installing the feature from the Karaf shell:

`feature:install opennms-situation-feedback`

To ensure that the feature continues to be installed on subsequent restarts, add `opennms-situation-feedback` to the `featuresBoot` property in the `${OPENNMS_HOME}/etc/org.apache.karaf.features.cfg`. ### Requirements The feature requires Elasticsearch to persist the feeback records. #### Configure Elasticsearch Persistence From a Karaf shell on your Meridian instance, start by configuring the situation feedback persistence to use your Elasticsearch cluster: ``````$ ssh -p 8101 admin@localhost
...
admin@opennms()> config:edit org.opennms.features.situationfeedback.persistence.elastic
admin@opennms()> config:property-set elasticUrl http://elastic:9200
admin@opennms()> config:update``````
 This configuration is stored in `\${OPENNMS_HOME}/etc/org.opennms.features.situationfeedback.persistence.elastic.cfg`. See Elasticsearch Integration for more information.

Installing the feature exposes a REST endpoint that OpenNMS Helm uses to display and submit feedback.

Find further information on the REST API in the Developer Guide.