hangc0276 opened a new pull request #6705: expose managedLedgerCache, managedLedger, loadBalance metrics to prometheus URL: https://github.com/apache/pulsar/pull/6705 ### Motivation The managed ledger read cache monitor metric is export via /admin/broker-stats/metrics with json format, it is hard to parse, collect and display, what's more the read cache is a very import module for message consuming throughput and latency. So collect and display the read cache metrics is extremely urgent for pulsar in production. ### Changes I parse the json format metric to prometheus message type and export to prometheus monitor port, so those metrics can be displayed in grafana. Please help check those changes, if it's ok, i will update the metric document.
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