prometheus: Add basic metrics for alerting

- Detect if we're falling behind while downloading
- Detect if there are any found certificates alerting

1 files changed, 7 insertions, 0 deletions

diff --git a/pkg/storage/index/index.go b/pkg/storage/index/index.go
index 0056565..bf94711 100644
--- a/pkg/storage/index/index.go
+++ b/pkg/storage/index/index.go
@@ -101,6 +101,13 @@ func (ix *Index) TriggerAlerts() ([]CertificateInfo, error) {
 	return alerts, ioutil.CommitJSON(ix.cfg.IndexFile, ix.mem)
 }
 
+func (ix *Index) Alerting() (ret []CertificateInfo) {
+	for _, ci := range ix.mem.Alerting {
+		ret = append(ret, ci[0]) // one is enough for the same crt ID
+	}
+	return
+}
+
 func (index *Index) Validate() error {
 	return nil // FIXME: check that the index is populated with valid values
 }