fix(regression): Fixes problem with metrics not exposed by plugins. (i…

…nfluxdata#12016)

agent/agent.go

@@ -280,60 +280,57 @@ func (a *Agent) runInputs(
 	unit *inputUnit,
 ) {
 	var wg sync.WaitGroup
+	tickers := make([]Ticker, len(unit.inputs))
 	for _, input := range unit.inputs {
-		a.runInput(ctx, startTime, unit, input, &wg)
-	}
-
-	wg.Wait()
+		// Overwrite agent interval if this plugin has its own.
+		interval := time.Duration(a.Config.Agent.Interval)
+		if input.Config.Interval != 0 {
+			interval = input.Config.Interval
+		}
 
-	log.Printf("D! [agent] Stopping service inputs")
-	stopServiceInputs(unit.inputs)
+		// Overwrite agent precision if this plugin has its own.
+		precision := time.Duration(a.Config.Agent.Precision)
+		if input.Config.Precision != 0 {
+			precision = input.Config.Precision
+		}
 
-	close(unit.dst)
-	log.Printf("D! [agent] Input channel closed")
-}
+		// Overwrite agent collection_jitter if this plugin has its own.
+		jitter := time.Duration(a.Config.Agent.CollectionJitter)
+		if input.Config.CollectionJitter != 0 {
+			jitter = input.Config.CollectionJitter
+		}
 
-func (a *Agent) runInput(ctx context.Context, startTime time.Time, unit *inputUnit, input *models.RunningInput, wg *sync.WaitGroup) {
-	// Overwrite agent interval if this plugin has its own.
-	interval := time.Duration(a.Config.Agent.Interval)
-	if input.Config.Interval != 0 {
-		interval = input.Config.Interval
-	}
+		// Overwrite agent collection_offset if this plugin has its own.
+		offset := time.Duration(a.Config.Agent.CollectionOffset)
+		if input.Config.CollectionOffset != 0 {
+			offset = input.Config.CollectionOffset
+		}
 
-	// Overwrite agent precision if this plugin has its own.
-	precision := time.Duration(a.Config.Agent.Precision)
-	if input.Config.Precision != 0 {
-		precision = input.Config.Precision
-	}
+		var ticker Ticker
+		if a.Config.Agent.RoundInterval {
+			ticker = NewAlignedTicker(startTime, interval, jitter, offset)
+		} else {
+			ticker = NewUnalignedTicker(interval, jitter, offset)
+		}
+		tickers = append(tickers, ticker)
 
-	// Overwrite agent collection_jitter if this plugin has its own.
-	jitter := time.Duration(a.Config.Agent.CollectionJitter)
-	if input.Config.CollectionJitter != 0 {
-		jitter = input.Config.CollectionJitter
-	}
+		acc := NewAccumulator(input, unit.dst)
+		acc.SetPrecision(getPrecision(precision, interval))
 
-	// Overwrite agent collection_offset if this plugin has its own.
-	offset := time.Duration(a.Config.Agent.CollectionOffset)
-	if input.Config.CollectionOffset != 0 {
-		offset = input.Config.CollectionOffset
-	}
-
-	var ticker Ticker
-	if a.Config.Agent.RoundInterval {
-		ticker = NewAlignedTicker(startTime, interval, jitter, offset)
-	} else {
-		ticker = NewUnalignedTicker(interval, jitter, offset)
+		wg.Add(1)
+		go func(input *models.RunningInput) {
+			defer wg.Done()
+			a.gatherLoop(ctx, acc, input, ticker, interval)
+		}(input)
 	}
-	defer ticker.Stop()
+	defer stopTickers(tickers)
+	wg.Wait()
 
-	acc := NewAccumulator(input, unit.dst)
-	acc.SetPrecision(getPrecision(precision, interval))
+	log.Printf("D! [agent] Stopping service inputs")
+	stopServiceInputs(unit.inputs)
 
-	wg.Add(1)
-	go func(input *models.RunningInput) {
-		defer wg.Done()
-		a.gatherLoop(ctx, acc, input, ticker, interval)
-	}(input)
+	close(unit.dst)
+	log.Printf("D! [agent] Input channel closed")
 }
 
 // testStartInputs is a variation of startInputs for use in --test and --once
@@ -1110,3 +1107,9 @@ func panicRecover(input *models.RunningInput) {
 			"https://github.com/influxdata/telegraf/issues/new/choose")
 	}
 }
+
+func stopTickers(tickers []Ticker) {
+	for _, ticker := range tickers {
+		ticker.Stop()
+	}
+}