Add mobile metrics (#27045)

* Add mobile metrics

* Fix mocks

* Add tests

* Fix lint

* Address feedback

* Fix lint

* Fix test

* Fix CI

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Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/app/metrics.go

@@ -46,6 +46,12 @@ func (a *App) RegisterPerformanceReport(rctx request.CTX, report *model.Performa
 			a.Metrics().ObserveClientRHSLoadDuration(commonLabels["platform"], commonLabels["agent"], h.Value/1000)
 		case model.ClientGlobalThreadsLoadDuration:
 			a.Metrics().ObserveGlobalThreadsLoadDuration(commonLabels["platform"], commonLabels["agent"], h.Value/1000)
+		case model.MobileClientLoadDuration:
+			a.Metrics().ObserveMobileClientLoadDuration(commonLabels["platform"], h.Value/1000)
+		case model.MobileClientChannelSwitchDuration:
+			a.Metrics().ObserveMobileClientChannelSwitchDuration(commonLabels["platform"], h.Value/1000)
+		case model.MobileClientTeamSwitchDuration:
+			a.Metrics().ObserveMobileClientTeamSwitchDuration(commonLabels["platform"], h.Value/1000)
 		default:
 			// we intentionally skip unknown metrics
 		}