create separate metric for last polled block

Author: iuwqyir

internal/metrics/metrics.go

@@ -50,6 +50,13 @@ var (
 	})
 )
 
+var (
+	PollerLastTriggeredBlock = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "poller_last_triggered_block",
+		Help: "The last block number that the poller was triggered for",
+	})
+)
+
 // Failure Recoverer Metrics
 var (
 	FailureRecovererLastTriggeredBlock = promauto.NewGauge(prometheus.GaugeOpts{

internal/orchestrator/poller.go

@@ -95,6 +95,9 @@ func (p *Poller) Start() {
 				}
 				log.Debug().Msgf("Polling %d blocks starting from %s to %s", len(blockNumbers), blockNumbers[0], endBlock)
 
+				endBlockNumberFloat, _ := endBlock.Float64()
+				metrics.PollerLastTriggeredBlock.Set(endBlockNumberFloat)
+
 				worker := worker.NewWorker(p.rpc)
 				results := worker.Run(blockNumbers)
 				p.handleWorkerResults(results)

internal/worker/worker.go

@@ -92,9 +92,8 @@ func (w *Worker) Run(blockNumbers []*big.Int) []WorkerResult {
 
 	// track the last fetched block number
 	if len(results) > 0 {
-		// dividing by 10 to avoid scientific notation (e.g. 1.23456e+07)
-		// TODO: find a solution
-		metrics.LastFetchedBlock.Set(float64(results[len(results)-1].BlockNumber.Uint64()) / 10)
+		lastBlockNumberFloat, _ := results[len(results)-1].BlockNumber.Float64()
+		metrics.LastFetchedBlock.Set(lastBlockNumberFloat)
 	}
 	return results
 }