NMS-15595: PersistRegexSelectorStrategy only works on string attributes

[Bonrob2]

Added note in the that the data collection resource types topic that PersistRegexSelectorStrategy only works on string attributes.

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• Jira (Issue Tracker): https://opennms.atlassian.net/browse/NMS-15595

[ProjectJYL]

I've tested the persist regex selector before. My results show filtering only works on string attributes. @mmahacek Can you confirm this?

[mmahacek]

Per

opennms/features/collection/api/src/main/java/org/opennms/netmgt/collection/support/PersistRegexSelectorStrategy.java

Lines 71 to 75 in fb14313

	public void visitAttribute(CollectionAttribute attribute) {
	if (!attribute.getType().isNumeric()) {
	context.setVariable(attribute.getName(), attribute.getStringValue());
	}
	}

, only non-numeric attributes are evaluated.