[jira] [Created] (HBASE-20234) Expose in-memory compaction metrics

["stack (JIRA)" <ji...@apache.org>]

stack created HBASE-20234:
-----------------------------

             Summary: Expose in-memory compaction metrics
                 Key: HBASE-20234
                 URL: https://issues.apache.org/jira/browse/HBASE-20234
             Project: HBase
          Issue Type: Sub-task
            Reporter: stack


Hard to glean insight from how well in-memory compaction is doing currently. It dumps stats into the logs but better if they were available to a dashboard. This issue is about exposing a couple of helpful counts. There are already by-region metrics. We can add a few for in-memory compaction (Help me out [~anastas]... what counts would be best to expose).

Flush related metrics include....

{code}
Namespace_default_table_tsdb-tree_region_cfbf23e7330a1a2bbde031f9583d3415_metric_flushesQueuedCount: {
description: "Number flushes requested/queued for this region",
value: 0

{
description: "The number of cells flushed to disk",
value: 0
},

{
description: "The total amount of data flushed to disk, in bytes",
value: 0
},

...
{code}



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