In a DX AIOps 21.3.1 on-prem environment there is following behaviour in OI:
It is impossible to define anomaly detection for some metrics, as is impossible to define a Metric Monitoring Group for these.
For example - if I want to create a metric monitoring group for the following APM metric
And enter the filter settings to identify it - it is not listed
Release : 21.3
In APM edit the Metric Grouping APM OI in Management Module SaaS and add the regex to include the required metrics the the Metric Specifier list
And then those metric were available in the Metric monitoring grouping create dialog in the OI settings