metrics/grafana: add more panels for old value

[5kbpers]

Signed-off-by: 5kbpers tangminghua@pingcap.com

What problem does this PR solve?

Previously we added some metrics for old value in tikv.

What is changed and how it works?

Add panels for those metrics.

Check List

Tests

• Manual test (add detailed scripts or steps below)

Related changes

• Need to cherry-pick to the release branch

Release note

• metrics/grafana: add more panels for old value

[overvenus]

/lgtm

[amyangfei]

/lgtm

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• amyangfei
• overvenus

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[amyangfei]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 198e670