MQE: include more information in query stats log lines #9505
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What this PR does
This PR adds more information to the "query stats" log lines emitted by MQE.
Specifically, it adds the expression, query type, time range and step.
This makes it easier to identify which query stats log line belongs to which query when the request trace is not sampled, as otherwise there is no identifying information beyond the time.
Which issue(s) this PR fixes or relates to
(none)
Checklist
CHANGELOG.md
updated - the order of entries should be[CHANGE]
,[FEATURE]
,[ENHANCEMENT]
,[BUGFIX]
.about-versioning.md
updated with experimental features.