Add call to optional Init function for all plugins (#5899)

internal/models/running_aggregator.go

@@ -71,6 +71,16 @@ func (r *RunningAggregator) Name() string {
 	return "aggregators." + r.Config.Name
 }
 
+func (r *RunningAggregator) Init() error {
+	if p, ok := r.Aggregator.(telegraf.Initializer); ok {
+		err := p.Init()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (r *RunningAggregator) Period() time.Duration {
 	return r.Config.Period
 }

internal/models/running_input.go

@@ -56,6 +56,16 @@ func (r *RunningInput) metricFiltered(metric telegraf.Metric) {
 	metric.Drop()
 }
 
+func (r *RunningInput) Init() error {
+	if p, ok := r.Input.(telegraf.Initializer); ok {
+		err := p.Init()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (r *RunningInput) MakeMetric(metric telegraf.Metric) telegraf.Metric {
 	if ok := r.Config.Filter.Select(metric); !ok {
 		r.metricFiltered(metric)

internal/models/running_output.go

@@ -97,6 +97,16 @@ func (ro *RunningOutput) metricFiltered(metric telegraf.Metric) {
 	metric.Drop()
 }
 
+func (ro *RunningOutput) Init() error {
+	if p, ok := ro.Output.(telegraf.Initializer); ok {
+		err := p.Init()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 // AddMetric adds a metric to the output.
 //
 // Takes ownership of metric

internal/models/running_processor.go

@@ -40,6 +40,16 @@ func containsMetric(item telegraf.Metric, metrics []telegraf.Metric) bool {
 	return false
 }
 
+func (rp *RunningProcessor) Init() error {
+	if p, ok := rp.Processor.(telegraf.Initializer); ok {
+		err := p.Init()
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 func (rp *RunningProcessor) Apply(in ...telegraf.Metric) []telegraf.Metric {
 	rp.Lock()
 	defer rp.Unlock()