Feat/head failure toggle (#928)

* feat: make head pull failure warning toggleable

* expect prometheus tests to go through EVENTUALLY

* wait for queue to be empty before checking test conditions

* clean up new head failure toggle

* fixup! clean up new head failure toggle

* test: add warn on head failure tests

* fix client interface and make tests hit more lines

* make all tests use NewClient instead of creating a struct pointer

* fix lint issues

* see if moving ubuntu out of the matrix solves test issue

Co-authored-by: nils måsén <nils@piksel.se>

pkg/metrics/metrics.go

@@ -29,6 +29,11 @@ func (metrics *Metrics) QueueIsEmpty() bool {
 	return len(metrics.channel) == 0
 }
 
+// QueueIsEmpty checks whether any messages are enqueued in the channel
+func (metrics *Metrics) QueueIsEmpty() bool {
+	return len(metrics.channel) == 0
+}
+
 // Register registers metrics for an executed scan
 func (metrics *Metrics) Register(metric *Metric) {
 	metrics.channel <- metric