Merge pull request #75557 from max-cx/OBSDOCS-1036

OBSDOCS-1036/TRACING-4106: mention that tempo gateway only supports gRPC for ingesting traces

Author: skopacz1

modules/distr-tracing-tempo-config-multitenancy.adoc

@@ -9,6 +9,11 @@
 Multitenancy with authentication and authorization is provided in the Tempo Gateway service.
 The authentication uses OpenShift OAuth and the Kubernetes `TokenReview` API. The authorization uses the Kubernetes `SubjectAccessReview` API.
 
+[NOTE]
+====
+The Tempo Gateway service supports ingestion of traces only via the OTLP/gRPC. The OTLP/HTTP is not supported.
+====
+
 .Sample Tempo CR with two tenants, `dev` and `prod`
 [source,yaml]
 ----