debug mysql latency

[capri-xiyue]

Description of your changes: debug mysql latency

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[google-oss-robot]

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[capri-xiyue]

/retest

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[rimolive]

Closing this issue. No activity for more than a year.

/close

[google-oss-prow[bot]]

@rimolive: Closed this PR.

In response to this:

Closing this issue. No activity for more than a year.

/close

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