defaultSidecarsByNamespace map[string]*SidecarScope
	// sidecarsForGatewayByNamespace contains the default sidecar for gateways and waypoints,
	// These are *always* computed from DefaultSidecarScopeForGateway.
	// These are lazy-loaded. Access protected by derivedSidecarMutex.
	sidecarsForGatewayByNamespace map[string]*SidecarScope

	// mutex to protect derived sidecars i.e. not specified by user.