merlimat opened a new pull request #8272:
URL: https://github.com/apache/pulsar/pull/8272
### Motivation
We currently don't have any metrics to check the rates or latencies of topic
lookup operations.
Adding:
* `pulsar_broker_load_manager_bundle_assigment`: Latency summary of bundles
ownership ops
* `pulsar_broker_lookup`:Latency summary of all lookup ops
* `pulsar_broker_lookup_redirects`: Counter of lookup redirections
* `pulsar_broker_lookup_failures`: Counter of lookup failures
* `pulsar_broker_lookup_answers`: Counter of lookup concrete answers (ie:
not redirects)
* `pulsar_broker_lookup_pending_requests`: Pending lookups in broker (when
it hits the max, requests are rejected)
* `pulsar_broker_topic_load_pending_request`: Pending topic loads operations
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