add prometheus instrumentation

internal/tasks/dailyAggregate.go

@@ -6,6 +6,7 @@ import (
 	"log/slog"
 	"time"
 	"vctp/db"
+	"vctp/internal/metrics"
 	"vctp/internal/report"
 )
 
@@ -27,6 +28,7 @@ func (c *CronTask) AggregateDailySummary(ctx context.Context, date time.Time, fo
 }
 
 func (c *CronTask) aggregateDailySummary(ctx context.Context, targetTime time.Time, force bool) error {
+	jobStart := time.Now()
 	dayStart := time.Date(targetTime.Year(), targetTime.Month(), targetTime.Day(), 0, 0, 0, 0, targetTime.Location())
 	dayEnd := dayStart.AddDate(0, 0, 1)
 	summaryTable, err := dailySummaryTableName(targetTime)
@@ -133,9 +135,12 @@ func (c *CronTask) aggregateDailySummary(ctx context.Context, targetTime time.Ti
 
 	if err := c.generateReport(ctx, summaryTable); err != nil {
 		c.Logger.Warn("failed to generate daily report", "error", err, "table", summaryTable)
+		metrics.RecordDailyAggregation(time.Since(jobStart), err)
+		return err
 	}
 
 	c.Logger.Debug("Finished daily inventory aggregation", "summary_table", summaryTable)
+	metrics.RecordDailyAggregation(time.Since(jobStart), nil)
 	return nil
 }