jmx.monitor.error.type notif not sent by Counter/Gauge monitor starting monitoring a null value

When a Counter or gauge monitor starts and the monitored value of the observed object is null, it is an error type case according jmx specification.
The JMX spec says "jmx.monitor.error.type notification should be sent
when the object instance of the observed attribute value is null
or not of the appropriate type for the given monitor".
Current implementation does not emit a jmx.monitor.error.type notification nor any other one.

Attached a small Java code that demonstrates the issue.
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