move business logic out of exporter and cleanup metrics
as discussed in tpo/tpa/prometheus-alerts!34 (comment 2936553), make some improvements to the exporter here to provide better metrics and move business logic in the alerting repository.
as discussed in tpo/tpa/prometheus-alerts!34 (comment 2936553), make some improvements to the exporter here to provide better metrics and move business logic in the alerting repository.