metrics(ticdc): add kafka compression ratio description for grafana

[sdojjy]

What problem does this PR solve?

Issue Number: close #11347

What is changed and how it works?

add kafka compression ratio description for grafana

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Questions

Will it cause performance regression or break compatibility?

Do you need to update user documentation, design documentation or monitoring documentation?

Release note

`None`.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: 3AceShowHand, asddongmen

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/tiflow/blob/master/OWNERS)~~ [3AceShowHand,asddongmen] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-06-26 07:36:43.843256601 +0000 UTC m=+791530.328745435: :ballot_box_with_check: agreed by 3AceShowHand.
• 2024-06-26 07:38:13.392035974 +0000 UTC m=+791619.877524806: :ballot_box_with_check: agreed by asddongmen.

[sdojjy]

/retest-required

[sdojjy]

/retest-required

[sdojjy]

/retest-required

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 57.6426%. Comparing base (a2e6219) to head (d2918fd).

Additional details and impacted files

| [Components](https://app.codecov.io/gh/pingcap/tiflow/pull/11348/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [cdc](https://app.codecov.io/gh/pingcap/tiflow/pull/11348/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `61.4595% <ø> (+0.0304%)` | :arrow_up: | | [dm](https://app.codecov.io/gh/pingcap/tiflow/pull/11348/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `51.1990% <ø> (-0.0283%)` | :arrow_down: | | [engine](https://app.codecov.io/gh/pingcap/tiflow/pull/11348/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `63.4091% <ø> (+0.0352%)` | :arrow_up: | | [Flag](https://app.codecov.io/gh/pingcap/tiflow/pull/11348/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | Coverage Δ | | |---|---|---| | [unit](https://app.codecov.io/gh/pingcap/tiflow/pull/11348/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap) | `57.6426% <ø> (+0.0079%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=pingcap#carryforward-flags-in-the-pull-request-comment) to find out more. ```diff @@ Coverage Diff @@ ## master #11348 +/- ## ================================================ + Coverage 57.6347% 57.6426% +0.0079% ================================================ Files 849 849 Lines 126160 126160 ================================================ + Hits 72712 72722 +10 + Misses 48048 48038 -10 Partials 5400 5400 ```

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #11352.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #11353.