[GitHub] [pulsar] sijie opened a new pull request #3849: [stats] Expose namespace topics count when exposing topic level metrics

[GitBox <gi...@apache.org>]

sijie opened a new pull request #3849: [stats] Expose namespace topics count when exposing topic level metrics
URL: https://github.com/apache/pulsar/pull/3849
 
 
   *Motivation*
   
   Topics count is a namespace level metric. Currently if `exposeTopicLevelMetricsInPrometheus=true`
   we don't expose `pulsar_topics_count`. However `pulsar_topics_count` is a very useful metric for
   monitoring the healthy of the cluster.
   
   *Modifications*
   
   if `exposeTopicLevelMetricsInPrometheus=true`, we expose namespace level metrics that are not
   exposed at topic level. e.g. `pulsar_topics_count`.
   
   

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