fix(aggregators): Handle time drift when calculating aggregation windows (#16375)

Co-authored-by: Joachim DB Systel <joachim.schachermayer@deutschebahn.com>

models/running_aggregator.go

@@ -177,6 +177,17 @@ func (r *RunningAggregator) Push(acc telegraf.Accumulator) {
 
 	since := r.periodEnd
 	until := r.periodEnd.Add(r.Config.Period)
+
+	// Check if the next aggregation window will contain "now". This might
+	// not be the case if the machine's clock was adjusted or the machine
+	// hibernated as in those cases the clock might be advanced before or
+	// after the initial aggregation window.
+	nowWall := time.Now().Truncate(-1)
+	if nowWall.Before(since.Truncate(-1)) || nowWall.After(until.Truncate(-1)) {
+		since = nowWall.Truncate(r.Config.Period)
+		until = since.Add(r.Config.Period)
+	}
+
 	r.UpdateWindow(since, until)
 
 	start := time.Now()