[feat] Support etcd monitoring - #4306
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Add etcd monitoring template (etcd 3.4+) collecting leader status, database size, leader changes and process CPU/memory from etcd's Prometheus /metrics endpoint. Includes help docs (en, zh-cn), sidebar entry and an e2e test asserting exact collected values against a fixture captured from a real etcd v3.5.17 instance. Closes apache#549
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What's changed?
Closes #549: add etcd monitoring support.
New
etcdmonitor type (Mid Monitor category) collecting from etcd's Prometheus/metricsendpoint over HTTP — no agent, no extra etcd configuration in the common case:etcd_server_has_leader(priority 0)etcd_mvcc_db_total_size_in_bytesreplaced theetcd_debugging_*name in 3.4)--listen-metrics-urlsE2E 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
Add or update API