Dashboards: Add a config setting that limits the number of series that will be displayed in a panel. Users can opt in to render all series. (#103405)

* Limit series in panels in dashboards

* fix mangled comment

pkg/api/dtos/frontend_settings.go

@@ -194,6 +194,7 @@ type FrontendSettingsDTO struct {
 	AnalyticsConsoleReporting bool `json:"analyticsConsoleReporting"`
 
 	DashboardPerformanceMetrics []string `json:"dashboardPerformanceMetrics"`
+	PanelSeriesLimit            int      `json:"panelSeriesLimit"`
 
 	FeedbackLinksEnabled                bool     `json:"feedbackLinksEnabled"`
 	ApplicationInsightsConnectionString string   `json:"applicationInsightsConnectionString"`

pkg/api/frontendsettings.go

@@ -216,6 +216,7 @@ func (hs *HTTPServer) getFrontendSettings(c *contextmodel.ReqContext) (*dtos.Fro
 		RudderstackIntegrationsUrl:          hs.Cfg.RudderstackIntegrationsURL,
 		AnalyticsConsoleReporting:           hs.Cfg.FrontendAnalyticsConsoleReporting,
 		DashboardPerformanceMetrics:         hs.Cfg.DashboardPerformanceMetrics,
+		PanelSeriesLimit:                    hs.Cfg.PanelSeriesLimit,
 		FeedbackLinksEnabled:                hs.Cfg.FeedbackLinksEnabled,
 		ApplicationInsightsConnectionString: hs.Cfg.ApplicationInsightsConnectionString,
 		ApplicationInsightsEndpointUrl:      hs.Cfg.ApplicationInsightsEndpointUrl,