[Rhythm] Metrics generator read from kafka first pass #4359
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What this PR does:
If enabled, reads from kafka every 2 seconds. The data is sent to span metrics and service graphs, but not local blocks, to ensure that it doesn't get flushed to storage, which is now the task of the block builder.
TODO - Maintain a separate local blocks processor to serve queries over recent data (that doesn't flush).
Which issue(s) this PR fixes:
Fixes #
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]