hangc0276 opened a new pull request #6615: Export ManagedLedgerCache metric to prometheus URL: https://github.com/apache/pulsar/pull/6615 ### 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. Some of the metric name contains dot, but promethues metric name rule only accept `[a-zA-Z0-9_:]`, so i replace `dot` to `:` in metric name to avoid prometheus parse error
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