AddMetricsTransportWrapper adds a transport wrapper which increments 'argocd_app_k8s_request_total' counter on each kubernetes request.

NewAppCollector returns a prometheus collector for application metrics.

NewAppRegistry creates a new prometheus registry that collects applications.

NewMetricsServer returns a new prometheus server which collects application metrics.

EnvVarLegacyControllerMetrics is a env var to re-enable deprecated prometheus metrics.

MetricsPath is the endpoint to collect application metrics.