OBSDOCS-1114: Document OTLP HTTP on Tempo Gateway

Author: pavolloffay

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

@@ -150,7 +150,7 @@ spec:
         bearertokenauth:
           filename: "/var/run/secrets/kubernetes.io/serviceaccount/token"
       exporters:
-        otlp/dev:
+        otlp/dev: # <1>
           endpoint: tempo-simplest-gateway.tempo.svc.cluster.local:8090
           tls:
             insecure: false
@@ -159,9 +159,21 @@ spec:
             authenticator: bearertokenauth
           headers:
             X-Scope-OrgID: "dev"
+        otlphttp/dev: # <2>
+          endpoint: https://tempo-simplest-gateway.chainsaw-multitenancy.svc.cluster.local:8080/api/traces/v1/dev
+          tls:
+            insecure: false
+            ca_file: "/var/run/secrets/kubernetes.io/serviceaccount/service-ca.crt"
+          auth:
+            authenticator: bearertokenauth
+          headers:
+            X-Scope-OrgID: "dev"
       service:
         extensions: [bearertokenauth]
         pipelines:
           traces:
-            exporters: [otlp/dev]
+            exporters: [otlp/dev] # <3>
 ----
+<1> OTLP gRPC Exporter.
+<2> OTLP HTTP Exporter.
+<3> You can specify `otlp/dev` for the OTLP gRPC Exporter or `otlphttp/dev` for the OTLP HTTP Exporter.