Fixup some code based on feedback from @dgnorton

internal/models/makemetric.go

@@ -19,6 +19,7 @@ import (
 //   applyFilter:  if false, the above filter is not applied to each metric.
 //                 This is used by Aggregators, because aggregators use filters
 //                 on incoming metrics instead of on created metrics.
+// TODO refactor this to not have such a huge func signature.
 func makemetric(
 	measurement string,
 	fields map[string]interface{},

internal/models/running_aggregator.go

@@ -109,13 +109,6 @@ func (r *RunningAggregator) Run(
 	acc telegraf.Accumulator,
 	shutdown chan struct{},
 ) {
-	if r.Config.Delay == 0 {
-		r.Config.Delay = time.Millisecond * 100
-	}
-	if r.Config.Period == 0 {
-		r.Config.Period = time.Second * 30
-	}
-
 	time.Sleep(r.Config.Delay)
 	periodT := time.NewTicker(r.Config.Period)
 	defer periodT.Stop()

internal/models/running_aggregator_test.go

@@ -20,6 +20,7 @@ func TestAdd(t *testing.T) {
 		Filter: Filter{
 			NamePass: []string{"*"},
 		},
+		Period: time.Millisecond * 500,
 	})
 	assert.NoError(t, ra.Config.Filter.Compile())
 	acc := testutil.Accumulator{}