ParseExpression returns an expression that's been generated from the given string, in case of an error the error gets returned as the second value.

=.

it has been decided by the filter that this metric does not end up in the result set.

<tag>!="" specified tag must be present.

=~ regular expression.

special case of expression that matches every metric (f.e.

special case of expression that matches no metric (f.e.

__tag=~ relies on special key __tag.

no decision has been made, because the decision might change depending on what other indexes defines.

!=.

<tag>="" specified tag must not be present.

!=~.

the filter has passed.

^= exact prefix, not regex.

__tag^= exact prefix with tag.

the function we use to get the hash for hashing the meta records it can be replaced for mocking in tests.

Expression represents one expression inside a query of one or many expressions.

MetricDefinitionFilter takes a metric name together with its tags and returns a FilterDecision.

go:generate msgp.