TiFlash: add missing TiFlash Grafana metrics

[hfxsd]

Expand TiFlash monitoring doc by adding many new metrics and sections across the Grafana dashboards. Clarifies that TiFlash proxy/raft metrics overlap heavily with TiKV. Added/renamed entries (e.g. Read Index OPS -> Raft Read Index OPS, Wait Index Duration -> Raft Wait Index Duration) and introduced Write & Delta Management Total. New sections include Imbalance read/write, Memory trace, Storage Read Pool & Data Sharing, PageStorage, Rate Limiter, Raft Snapshot / IngestSST, Disaggregated-Write/Compute, S3, Pipeline Model, TiFlash Resource Control, Status Server, Vector Search, and extensive expansions to TiFlash-Proxy-Summary and TiFlash-Proxy-Details (cluster, errors, server, thread CPU, PD, raft IO/process/message/propose/admin, unified read pool, storage, scheduler, snapshot, task, threads, RocksDB, encryption, etc.). These additions improve coverage and clarity for TiFlash cluster monitoring.

First-time contributors' checklist

• I've signed the Contributor License Agreement, which is required for the repository owners to accept my contribution.

What is changed, added or deleted? (Required)

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)
• v6.1 (TiDB 6.1 versions)
• v5.4 (TiDB 5.4 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[xzhangxian1008]

/assign

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please ask for approval from hfxsd. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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

Details

Needs approval from an approver in each of these files:

• OWNERS

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]

@hfxsd: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	733f73d	link	true	/test pull-verify

Full PR test history. Your PR dashboard.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.