[SOLR-11201] Implement trigger for arbitrary metrics

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 7.3, 8.0
• Component/s: AutoScaling, SolrCloud
• Assignee: Shalin Shekhar Mangar
• Reporter: Shalin Shekhar Mangar
• Created: 05/Aug/17 02:37
• Updated: 02/Oct/19 17:25
• Resolved: 26/Feb/18 16:53

Description

It should be possible to set a trigger on any metrics exposed by the Metrics API using a threshold value. Supporting waitFor may not be possible or useful for all metrics. For those we will implement proper trigger support (such as searchRate) However, a naive implementation might be to just poll the value of the metric frequently and if it is consistently above the threshold, fire the trigger.