Cherry-pick #8621 to 6.x: Enhanced Heartbeat Telemetry #8719
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Cherry-pick of PR #8621 to 6.x branch. Original message:
Add heartbeat telemetry. We now track:
One note for reviewers, I changed the signature of the
create
function used by heartbeat plugins to return the number ofendpoint
s for the given monitor.An alternate approach I considered was refactoring from the FP style for plugins to a more OO style where the stats could be pulled after creation by navigating a map of monitor objects. I considered this to be a more minimal change, but would welcome some feedback.