telemetry: telemetry supports count flashback cluster

[Defined2014]

What problem does this PR solve?

Issue Number: close #38896

Problem Summary:

What is changed and how it works?

Check List

Tests

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

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• tangenta
• xhebox

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[AilinKid]

LGTM

[AilinKid]

/merge

[ti-chi-bot]

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

Commit hash: a536d6a

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #38908.

[sre-bot]

TiDB MergeCI notify

🔴 Bad News! New failing [4] after this pr merged.
These new failed integration tests seem to be caused by the current PR, please try to fix these new failed integration tests, thanks!

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci-tidb/integration-ddl-test	🟥 failed 2, success 4, total 6	30 min	New failing
idc-jenkins-ci-tidb/integration-common-test	🟥 failed 2, success 15, total 17	11 min	New failing
idc-jenkins-ci-tidb/sqllogic-test-2	🟥 failed 2, success 26, total 28	9 min 39 sec	New failing
idc-jenkins-ci-tidb/sqllogic-test-1	🟥 failed 2, success 24, total 26	6 min 13 sec	New failing
idc-jenkins-ci/integration-cdc-test	🔴 failed 5, success 34, total 39	23 min	Existing failure
idc-jenkins-ci-tidb/common-test	🟢 all 11 tests passed	9 min 24 sec	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	5 min 33 sec	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	3 min 13 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	2 min 33 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed