MM-58281 Allow client metrics to be floats and round timestamps (#27027)

* MM-58281 Allow client metrics to be floats and round timestamps

* MM-58281 Fix report version

* Ensure reports can contain a single timestamp

* Round timestamps in unit tests

server/channels/app/metrics.go

@@ -18,7 +18,7 @@ func (a *App) RegisterPerformanceReport(rctx request.CTX, report *model.Performa
 	for _, c := range report.Counters {
 		switch c.Metric {
 		case model.ClientLongTasks:
-			a.Metrics().IncrementClientLongTasks(commonLabels["platform"], commonLabels["agent"], float64(c.Value))
+			a.Metrics().IncrementClientLongTasks(commonLabels["platform"], commonLabels["agent"], c.Value)
 		default:
 			// we intentionally skip unknown metrics
 		}
@@ -27,21 +27,21 @@ func (a *App) RegisterPerformanceReport(rctx request.CTX, report *model.Performa
 	for _, h := range report.Histograms {
 		switch h.Metric {
 		case model.ClientTimeToFirstByte:
-			a.Metrics().ObserveClientTimeToFirstByte(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+			a.Metrics().ObserveClientTimeToFirstByte(commonLabels["platform"], commonLabels["agent"], h.Value)
 		case model.ClientFirstContentfulPaint:
-			a.Metrics().ObserveClientFirstContentfulPaint(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+			a.Metrics().ObserveClientFirstContentfulPaint(commonLabels["platform"], commonLabels["agent"], h.Value)
 		case model.ClientLargestContentfulPaint:
-			a.Metrics().ObserveClientLargestContentfulPaint(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+			a.Metrics().ObserveClientLargestContentfulPaint(commonLabels["platform"], commonLabels["agent"], h.Value)
 		case model.ClientInteractionToNextPaint:
-			a.Metrics().ObserveClientInteractionToNextPaint(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+			a.Metrics().ObserveClientInteractionToNextPaint(commonLabels["platform"], commonLabels["agent"], h.Value)
 		case model.ClientCumulativeLayoutShift:
-			a.Metrics().ObserveClientCumulativeLayoutShift(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+			a.Metrics().ObserveClientCumulativeLayoutShift(commonLabels["platform"], commonLabels["agent"], h.Value)
 		case model.ClientChannelSwitchDuration:
-			a.Metrics().ObserveClientChannelSwitchDuration(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+			a.Metrics().ObserveClientChannelSwitchDuration(commonLabels["platform"], commonLabels["agent"], h.Value)
 		case model.ClientTeamSwitchDuration:
-			a.Metrics().ObserveClientTeamSwitchDuration(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+			a.Metrics().ObserveClientTeamSwitchDuration(commonLabels["platform"], commonLabels["agent"], h.Value)
 		case model.ClientRHSLoadDuration:
-			a.Metrics().ObserveClientRHSLoadDuration(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+			a.Metrics().ObserveClientRHSLoadDuration(commonLabels["platform"], commonLabels["agent"], h.Value)
 		default:
 			// we intentionally skip unknown metrics
 		}

server/public/model/metrics.go

@@ -35,7 +35,7 @@ var (
 
 type MetricSample struct {
 	Metric    MetricType        `json:"metric"`
-	Value     int64             `json:"value"`
+	Value     float64           `json:"value"`
 	Timestamp int64             `json:"timestamp,omitempty"`
 	Labels    map[string]string `json:"labels,omitempty"`
 }
@@ -65,7 +65,7 @@ func (r *PerformanceReport) IsValid() error {
 		return fmt.Errorf("report version is not supported: server version: %s, report version: %s", performanceReportVersion.String(), r.Version)
 	}
 
-	if r.Start >= r.End {
+	if r.Start > r.End {
 		return fmt.Errorf("report timestamps are erroneous")
 	}