Impala Public Jenkins has submitted this change and it was merged. ( 
http://gerrit.cloudera.org:8080/24844 )

Change subject: IMPALA-15037: Add profile counters for HBO
......................................................................

IMPALA-15037: Add profile counters for HBO

This patch adds the following profile counters for HBO:
- HBOStats.HitCount: Number of reads that found the key in the cache.
- HBOStats.ReadCount: Number of cache-backend lookups performed.
- HBOStats.ReadTime: Time spent reading HBO stats from the cache.
- HBOStats.TotalTime: Total time in using HBO stats, including time spent
  in generating HBO key strings.

Testing
 - Add e2e tests

Assisted-by: Opus 4.8 (Claude Code)
Change-Id: Ief6235094df8a16a283c395f74486d71c46bb142
Reviewed-on: http://gerrit.cloudera.org:8080/24844
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
---
M fe/src/main/java/org/apache/impala/planner/PlanNode.java
M fe/src/main/java/org/apache/impala/service/HistoricalStats.java
M tests/query_test/test_observability.py
3 files changed, 93 insertions(+), 16 deletions(-)

Approvals:
  Impala Public Jenkins: Looks good to me, approved; Verified

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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: merged
Gerrit-Change-Id: Ief6235094df8a16a283c395f74486d71c46bb142
Gerrit-Change-Number: 24844
Gerrit-PatchSet: 3
Gerrit-Owner: Quanlong Huang <[email protected]>
Gerrit-Reviewer: Aleksandr Efimov <[email protected]>
Gerrit-Reviewer: Aman Sinha <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Nandor Kollar <[email protected]>
Gerrit-Reviewer: Quanlong Huang <[email protected]>
Gerrit-Reviewer: Steve Carlin <[email protected]>

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