gauges for current batch id & normalized batch id

flow/activities/flowable_core.go

@@ -349,6 +349,16 @@ func syncCore[TPull connectors.CDCPullConnectorCore, TSync connectors.CDCSyncCon
 	activity.RecordHeartbeat(ctx, pushedRecordsWithCount)
 	a.Alerter.LogFlowInfo(ctx, flowName, pushedRecordsWithCount)
 
+	if a.OtelManager != nil {
+		currentBatchID, err := a.OtelManager.GetOrInitInt64Gauge(
+			otel_metrics.BuildMetricName(otel_metrics.CurrentBatchIdGaugeName))
+		if err != nil {
+			logger.Error("Failed to get current batch id gauge", slog.Any("error", err))
+		} else {
+			currentBatchID.Record(ctx, res.CurrentSyncBatchID)
+		}
+	}
+
 	if err := a.applySchemaDeltas(ctx, config, options, res.TableSchemaDeltas); err != nil {
 		return 0, err
 	}
@@ -666,6 +676,15 @@ func (a *FlowableActivity) normalizeLoop(
 				} else if req.Done != nil {
 					close(req.Done)
 				}
+				if a.OtelManager != nil {
+					lastNormalizedBatchID, err := a.OtelManager.GetOrInitInt64Gauge(
+						otel_metrics.BuildMetricName(otel_metrics.LastNormalizedBatchIdGaugeName))
+					if err != nil {
+						logger.Error("Failed to get normalized batch id gauge", slog.Any("error", err))
+					} else {
+						lastNormalizedBatchID.Record(ctx, req.BatchID)
+					}
+				}
 				break
 			}
 		case <-syncDone:

flow/otel_metrics/otel_manager.go

@@ -19,14 +19,18 @@ import (
 
 const (
 	SlotLagGaugeName                    string = "cdc_slot_lag"
-	OpenConnectionsGaugeName            string = "open_connections"
-	OpenReplicationConnectionsGaugeName string = "open_replication_connections"
-	IntervalSinceLastNormalizeGaugeName string = "interval_since_last_normalize"
-	FetchedBytesCounterName             string = "fetched_bytes"
+	CurrentBatchIdGaugeName                    = "current_batch_id"
+	LastNormalizedBatchIdGaugeName             = "last_normalized_batch_id"
+	OpenConnectionsGaugeName                   = "open_connections"
+	OpenReplicationConnectionsGaugeName        = "open_replication_connections"
+	IntervalSinceLastNormalizeGaugeName        = "interval_since_last_normalize"
+	FetchedBytesCounterName                    = "fetched_bytes"
 )
 
 type SlotMetricGauges struct {
 	SlotLagGauge                    metric.Float64Gauge
+	CurrentBatchIdGauge             metric.Int64Gauge
+	LastNormalizedBatchIdGauge      metric.Int64Gauge
 	OpenConnectionsGauge            metric.Int64Gauge
 	OpenReplicationConnectionsGauge metric.Int64Gauge
 	IntervalSinceLastNormalizeGauge metric.Float64Gauge