allow ingester and distributor to run on same instance (#4348)

* allow ingester and distributor to run on same instance

Signed-off-by: Trevor Whitney <trevorjwhitney@gmail.com>

* add comment around conditional distributor Push registration

Co-authored-by: Ed Welch <edward.welch@grafana.com>

* lint

Co-authored-by: Ed Welch <edward.welch@grafana.com>

pkg/loki/modules.go

@@ -173,7 +173,9 @@ func (t *Loki) initDistributor() (services.Service, error) {
 		return nil, err
 	}
 
-	if !t.Cfg.isModuleEnabled(All) {
+	// Register the distributor to receive Push requests over GRPC
+	// EXCEPT when running with `-target=all` or `-target=` contains `ingester`
+	if !t.Cfg.isModuleEnabled(All) && !t.Cfg.isModuleEnabled(Ingester) {
 		logproto.RegisterPusherServer(t.Server.GRPC, t.distributor)
 	}