maksaska opened a new pull request, #13575:
URL: https://github.com/apache/ignite/pull/13575

   The MBean name of a metric registry was spelled out at every call site, and 
every one of them read an attribute as next(mbean.Attr).strip(). Both are now 
in one place:
   
     * metric_registry_pattern(group, name) builds the name pattern, honouring 
the two rules the JMX exporter follows - the registry name is split at its 
FIRST dot, and the tail is quoted only when it is not purely alphanumeric. The 
pattern the rebalance metrics used, '.*group=cacheGroups.*name="%s"', required 
the quotes unconditionally and so could not find the registry of an 
alphanumeric cache group name at all.
     * The pattern ends at the end of the line. 'name' sorts last of an MBean 
name's properties, so without the anchor a registry whose name is a prefix of 
another one ("myCache" against "myCacheV2") matched the wrong bean.
     * JmxMBean.value()/bool_value() read a single valued attribute.
     * cache_mbean()/cache_group_mbean() expose the two registries a test asks 
for.
   
   Also documents why IgniteAwareService.await_rebalance() builds a JmxClient 
of its own instead of the node's memoized one: the memoized client holds the 
pid of the incarnation it was built for, and await_rebalance() runs right after 
a restart.
   
   check_jmx_utils.py covers the pattern, including both cases that used to be 
wrong.
   
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