Return 503 on hitting distributor instance limits #6387
Merged
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What this PR does:
Change the response code of the error to HTTP 503 returned by distributors when any of the distributor instance limits are hit, as these are errors on the service side not the client side.
Which issue(s) this PR fixes:
Fixes #6358
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]