Add README instructions

Signed-off-by: Jonas De Gendt <[email protected]>

Author: jdegendt

charts/tempo-distributed/README.md

@@ -993,7 +993,7 @@ The memcached default args are removed and should be provided manually. The sett
 | traces.opencensus.enabled | bool | `false` | Enable Tempo to ingest Open Census traces |
 | traces.opencensus.receiverConfig | object | `{}` | Open Census receiver config |
 | traces.otlp.grpc.enabled | bool | `false` | Enable Tempo to ingest Open Telemetry GRPC traces |
-| traces.otlp.grpc.port | int | `4317` |  |
+| traces.otlp.grpc.port | int | `4317` | Default OTLP gRPC port |
 | traces.otlp.grpc.receiverConfig | object | `{}` | GRPC receiver advanced config |
 | traces.otlp.http.enabled | bool | `false` | Enable Tempo to ingest Open Telemetry HTTP traces |
 | traces.otlp.http.receiverConfig | object | `{}` | HTTP receiver advanced config |
@@ -1135,3 +1135,26 @@ config: |
         service: memcached-client
         timeout: 500ms
 ```
+
+### Enabling gRPC Open Telemetry
+
+gRPC for Open Telemetry is disabled by default, simply flip the bool in the `traces` block to turn it on.
+
+If you have enabled the gateway as well, this will let you push traces using the default Open Telemetry API path (`/opentelemetry.proto.collector.trace.v1.TraceService/Export`), on the 4317 port. This port can be overwriten as well in the values.
+
+```yaml
+traces:
+  otlp:
+    http:
+      # -- Enable Tempo to ingest Open Telemetry HTTP traces
+      enabled: false
+      # -- HTTP receiver advanced config
+      receiverConfig: {}
+    grpc:
+      # -- Enable Tempo to ingest Open Telemetry GRPC traces
+      enabled: true
+      # -- GRPC receiver advanced config
+      receiverConfig: {}
+      # -- Default OTLP gRPC port
+      port: 4317
+```

charts/tempo-distributed/README.md.gotmpl

@@ -391,3 +391,26 @@ config: |
         service: memcached-client
         timeout: 500ms
 ```
+
+### Enabling gRPC Open Telemetry
+
+gRPC for Open Telemetry is disabled by default, simply flip the bool in the `traces` block to turn it on.
+
+If you have enabled the gateway as well, this will let you push traces using the default Open Telemetry API path (`/opentelemetry.proto.collector.trace.v1.TraceService/Export`), on the 4317 port. This port can be overwriten as well in the values.
+
+```yaml
+traces:
+  otlp:
+    http:
+      # -- Enable Tempo to ingest Open Telemetry HTTP traces
+      enabled: false
+      # -- HTTP receiver advanced config
+      receiverConfig: {}
+    grpc:
+      # -- Enable Tempo to ingest Open Telemetry GRPC traces
+      enabled: true
+      # -- GRPC receiver advanced config
+      receiverConfig: {}
+      # -- Default OTLP gRPC port
+      port: 4317
+```