MXS-2363 Add section to release notes
Also fix some minor other things in the relase notes.
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		@ -76,6 +76,8 @@ being drained is the master, then it will not be possible to connect
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unless `master_failure_mode` has been set to something else but the
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default `fail_instantly`.
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Once the server has been drained, the state will be `Drained`.
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### Cluster
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The servers a service uses can now be specified using the `cluster`
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@ -101,6 +103,21 @@ for details.
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_Not_ providing an explicit unit has been deprecated in MaxScale 2.4.
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### Query Classifier Cache
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It is now possible to examine the contents of the query classifier cache.
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The REST-API endpoint is
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```
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/v1/maxscale/query_classifier/cache
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```
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and the equivalent _maxctrl_ command
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```
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maxctrl show qc_cache
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```
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The output shows the statements (the canonical version) in the cache,
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the number of times they have been encountered and how they have been
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classified.
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## Bug fixes
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[Here is a list of bugs fixed in MaxScale 2.4.0.](https://jira.mariadb.org/issues/?jql=project%20%3D%20MXS%20AND%20issuetype%20%3D%20Bug%20AND%20status%20%3D%20Closed%20AND%20fixVersion%20%3D%202.4.0)
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