ParseMatcher parses a string of $tag_key$op"$tag_value" form, where $op is one of the supported match operators.

ParseMatchers parses a string of $tag_matcher<,$tag_matchers> form.

ParseQuery parses a string of $app_name<{<$tag_matchers>}> form.

ValidateAppName report an error if the given app name n violates constraints.

ValidateTagKey report an error if the given key k violates constraints.

=.

=~.

!=.

!~.

ByPriority is a supplemental type for sorting tag matchers.