Make read-write mode test robust to instance startup race condition. #3447
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What this PR does
Builds on #3423, split from #3433.
The read-write mode integration test occasionally fails due to errors like "expanding series: empty ring" when querying for data. This PR adds a check that waits for the ingesters to become active before proceeding with the test.
Which issue(s) this PR fixes or relates to
#3363
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]