docs: Add OpenTelemetry OTLP connectors to Cloud docs (#491)

* docs: Add OpenTelemetry OTLP connectors to Cloud docs

Add four new OpenTelemetry Protocol (OTLP) connectors for Redpanda Cloud:

New connectors:
- otlp_grpc input: Receive traces, logs, and metrics via OTLP/gRPC
- otlp_http input: Receive traces, logs, and metrics via OTLP/HTTP
- otlp_grpc output: Send traces, logs, and metrics via OTLP/gRPC
- otlp_http output: Send traces, logs, and metrics via OTLP/HTTP

All connectors use include syntax to reference the source documentation
in rp-connect-docs repository.

Also updated whats-new-cloud.adoc with descriptions of the new connectors.

Related to: redpanda-data/rp-connect-docs#364

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

* fix what's new

* update nav

---------

Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: micheleRP

modules/ROOT/nav.adoc

@@ -92,6 +92,8 @@
 **** xref:develop:connect/components/inputs/nats.adoc[]
 **** xref:develop:connect/components/inputs/nats_jetstream.adoc[]
 **** xref:develop:connect/components/inputs/nats_kv.adoc[]
+**** xref:develop:connect/components/inputs/otlp_grpc.adoc[]
+**** xref:develop:connect/components/inputs/otlp_http.adoc[]
 **** xref:develop:connect/components/inputs/postgres_cdc.adoc[]
 **** xref:develop:connect/components/inputs/read_until.adoc[]
 **** xref:develop:connect/components/inputs/redis_list.adoc[]
@@ -148,6 +150,8 @@
 **** xref:develop:connect/components/outputs/nats.adoc[]
 **** xref:develop:connect/components/outputs/nats_jetstream.adoc[]
 **** xref:develop:connect/components/outputs/nats_kv.adoc[]
+**** xref:develop:connect/components/outputs/otlp_grpc.adoc[]
+**** xref:develop:connect/components/outputs/otlp_http.adoc[]
 **** xref:develop:connect/components/outputs/opensearch.adoc[]
 **** xref:develop:connect/components/outputs/pinecone.adoc[]
 **** xref:develop:connect/components/outputs/qdrant.adoc[]

modules/develop/pages/connect/components/inputs/otlp_grpc.adoc

@@ -0,0 +1,3 @@
+= otlp_grpc
+
+include::redpanda-connect:components:inputs/otlp_grpc.adoc[tag=single-source]

modules/develop/pages/connect/components/inputs/otlp_http.adoc

@@ -0,0 +1,3 @@
+= otlp_http
+
+include::redpanda-connect:components:inputs/otlp_http.adoc[tag=single-source]

modules/develop/pages/connect/components/outputs/otlp_grpc.adoc

@@ -0,0 +1,3 @@
+= otlp_grpc
+
+include::redpanda-connect:components:outputs/otlp_grpc.adoc[tag=single-source]

modules/develop/pages/connect/components/outputs/otlp_http.adoc

@@ -0,0 +1,3 @@
+= otlp_http
+
+include::redpanda-connect:components:outputs/otlp_http.adoc[tag=single-source]

modules/get-started/pages/whats-new-cloud.adoc

@@ -8,6 +8,15 @@ This page lists new features added to Redpanda Cloud.
 
 == January 2026
 
+=== Redpanda Connect updates
+
+* Inputs:
+** xref:develop:connect/components/inputs/otlp_grpc.adoc[otlp_grpc]: Receive OpenTelemetry traces, logs, and metrics via OTLP/gRPC protocol. Exposes an OpenTelemetry Collector gRPC receiver that accepts traces, logs, and metrics, converting them to individual Redpanda OTEL v1 protobuf messages optimized for Kafka partitioning.
+** xref:develop:connect/components/inputs/otlp_http.adoc[otlp_http]: Receive OpenTelemetry traces, logs, and metrics via OTLP/HTTP protocol. Supports both protobuf and JSON formats at standard OTLP endpoints, converting telemetry data to individual messages with embedded Resource and Scope metadata.
+* Outputs:
+** xref:develop:connect/components/outputs/otlp_grpc.adoc[otlp_grpc]: Send OpenTelemetry traces, logs, and metrics via OTLP/gRPC protocol. Accepts batches of Redpanda OTEL v1 protobuf messages and converts them to OTLP format for transmission to OpenTelemetry collectors.
+** xref:develop:connect/components/outputs/otlp_http.adoc[otlp_http]: Send OpenTelemetry traces, logs, and metrics via OTLP/HTTP protocol. Supports both protobuf and JSON content types for flexible integration with OpenTelemetry backends.
+
 === Redpanda Connect and Roles in Terraform provider
 
 The xref:manage:terraform-provider.adoc[Redpanda Terraform provider] now supports managing roles and Redpanda Connect pipelines. Use the provider to create and manage role-based access control and data pipelines in Redpanda Cloud.