[SLING-9589] Expose discovery metrics

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Discovery Support 1.0.4
• Fix Version/s: Discovery Support 1.0.6
• Component/s: Discovery
• Assignee: Stefan Egli
• Reporter: Stefan Egli
• Created: 15/Jul/20 16:45
• Updated: 18/Aug/20 13:18
• Resolved: 13/Aug/20 13:00

Description

Sling Discovery should expose useful metrics via dropwiard.

The suggested metrics include:

• event counts
• current changing status
• details about local cluster including number of instances, joins, leaves, leader switches, properties
• current (local instance's) leader status
• number of local instance's properties
• remote cluster details

This allows integration into downstream monitoring systems.