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Will DuanandGitHub ec258e0fdb Identify duplicated replication task and skip emitting lag metrics for duplicated replication task (#7299)
## What changed?
<!-- Describe what has changed in this PR -->
Introduce ErrDuplicate at replication code path to distinguish
duplicated replication task
## Why?
<!-- Tell your future self why have you made these changes -->
To better emit replication lag metrics
## How did you test it?
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test? Checked in staging env? -->
test will be added later.
## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->

## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->

## Is hotfix candidate?
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be sent to the broader community? (Yes/No) -->
2025-02-11 14:21:59 -08:00
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