Add new Metrics API (#26919)

server/channels/app/metrics.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package app
+
+import (
+	"github.com/mattermost/mattermost/server/public/model"
+	"github.com/mattermost/mattermost/server/public/shared/request"
+)
+
+func (a *App) RegisterPerformanceReport(rctx request.CTX, report *model.PerformanceReport) *model.AppError {
+	if a.Metrics() == nil {
+		return nil
+	}
+
+	commonLabels := report.ProcessLabels()
+
+	for _, c := range report.Counters {
+		switch c.Metric {
+		case model.ClientLongTasks:
+			a.Metrics().IncrementClientLongTasks(commonLabels["platform"], commonLabels["agent"], float64(c.Value))
+		default:
+			// we intentionally skip unknown metrics
+		}
+	}
+
+	for _, h := range report.Histograms {
+		switch h.Metric {
+		case model.ClientTimeToFirstByte:
+			a.Metrics().ObserveClientTimeToFirstByte(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+		case model.ClientFirstContentfulPaint:
+			a.Metrics().ObserveClientFirstContentfulPaint(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+		case model.ClientLargestContentfulPaint:
+			a.Metrics().ObserveClientLargestContentfulPaint(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+		case model.ClientInteractionToNextPaint:
+			a.Metrics().ObserveClientInteractionToNextPaint(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+		case model.ClientCumulativeLayoutShift:
+			a.Metrics().ObserveClientCumulativeLayoutShift(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+		case model.ClientChannelSwitchDuration:
+			a.Metrics().ObserveClientChannelSwitchDuration(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+		case model.ClientTeamSwitchDuration:
+			a.Metrics().ObserveClientTeamSwitchDuration(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+		case model.ClientRHSLoadDuration:
+			a.Metrics().ObserveClientRHSLoadDuration(commonLabels["platform"], commonLabels["agent"], float64(h.Value))
+		default:
+			// we intentionally skip unknown metrics
+		}
+	}
+
+	return nil
+}