* OK notifications using previous evaluation data
* copy rule.EvalMatches to avoid changes to the underlying array
* test cases added/modified
* delete trailing newline
* fix double newline in go import
* add change to the changelog
* specify that this only affects legacy alerting (changelog)
* use current eval data instead of prev eval data
* create evalMatch just once
* code comments, renamings, getTemplateMatches() function
* changelog and docs updated
5fb80498b1