[PR] [feat] Support etcd monitoring [hertzbeat]

["orangeCatDeveloper (via GitHub)" <gi...@apache.org>]

orangeCatDeveloper opened a new pull request, #4306:
URL: https://github.com/apache/hertzbeat/pull/4306

   ## What's changed?
   
   Closes #549: add etcd monitoring support.
   
   New `etcd` monitor type (Mid Monitor category) collecting from etcd's Prometheus `/metrics` endpoint over HTTP — no agent, no extra etcd configuration in the common case:
   
   - **Availability**: `etcd_server_has_leader` (priority 0)
   - **Metrics**: database size (B→MB), leader changes, process CPU time, process resident memory
   - Supports etcd **3.4+** (`etcd_mvcc_db_total_size_in_bytes` replaced the `etcd_debugging_*` name in 3.4)
   - Help docs (en, zh-cn) cover the localhost-only / mutual-TLS case via `--listen-metrics-urls`
   
   E2E test asserts the exact collected values (including the B→MB unit conversion) against a fixture captured from a real etcd v3.5.17 instance.
   
   Verified against a live etcd v3.5.17 container:
   
   ## Checklist
   
   - [x]  I have read the [Contributing Guide](https://hertzbeat.apache.org/docs/community/code_style_and_quality_guide)
   - [x]  I have written the necessary doc or comment.
   - [x]  I have added the necessary unit tests and all cases have passed.
   
   ## Add or update API
   
   - [x] I have added the necessary [e2e tests](https://github.com/apache/hertzbeat/tree/master/e2e) and all cases have passed.
   


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Re: [PR] [feat] Support etcd monitoring [hertzbeat]

["Duansg (via GitHub)" <gi...@apache.org>]

Duansg merged PR #4306:
URL: https://github.com/apache/hertzbeat/pull/4306


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