[SOLR-9960] MetricsHandler should support multiple prefixes.

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 6.4, 7.0
• Fix Version/s: 6.4, 7.0
• Component/s: metrics
• Assignee: Andrzej Bialecki
• Reporter: Andrzej Bialecki
• Created: 13/Jan/17 09:58
• Updated: 08/Jun/19 15:32
• Resolved: 14/Jan/17 11:29

Description

Some consumers of the /admin/metrics API need to retrieve only a number of specific metrics they are interested in, which don't share the same prefix. Additionally, selecting by "group" or "type" is insufficient when users need to retrieve metrics for a specific collection (all collections handled by a node belong to the same group "core").

Concrete examples of this kind of use are in SOLR-9857 and SOLR-9858.

The modification needed to support this in MetricsHandler is simple:

• support multiple "prefix" parameters
• support also "registryPrefix" parameter as an alternative to "group".