Support OTLP/HTTP receiver for traces, logs, and metrics

[wu-sheng]

Add OTLP/HTTP endpoints for traces, logs, and metrics

SkyWalking's OTLP receiver previously only supported gRPC. Many OTLP sources prefer or require HTTP:

• The OTel Swift SDK (iOS monitoring, SWIP-11) uses OTLP/HTTP as its primary exporter
• The SkyAPM Mini Program Monitor for WeChat/Alipay mini programs sends telemetry via HTTP
• OTLP/HTTP is simpler and more proxy/firewall-friendly than gRPC for mobile and browser clients

Each existing OTLP gRPC handler now also registers an HTTP handler at startup:

Endpoint	Content Types
POST /v1/traces	application/x-protobuf, application/json
POST /v1/logs	application/x-protobuf, application/json
POST /v1/metrics	application/x-protobuf, application/json

Processing logic extracted into shared processExport() methods called by both gRPC and HTTP handlers. No new configuration needed — HTTP endpoints are automatically available when the OTLP handler is enabled.

Also bumps infra-e2e to 0d91769 for Ryuk reaper bug fix.

• If this is non-trivial feature, paste the links/URLs to the design doc.
  • SWIP-11: [SWIP-11] [DISCUSS] Support iOS App Monitoring via OpenTelemetry #13821
  • OTLP/HTTP spec: https://opentelemetry.io/docs/specs/otlp/#otlphttp
  • SkyAPM Mini Program Monitor: https://github.com/SkyAPM/mini-program-monitor
• Update the documentation to include this new feature.
  • docs/en/setup/backend/otlp-trace.md — added OTLP/HTTP protocol table
• Tests(including UT, IT, E2E) are added to verify the new feature.
• Update the CHANGES log.

[Copilot]

Pull request overview

This PR extends the existing OTLP receiver in OAP from gRPC-only to also support OTLP/HTTP ingestion for traces, logs, and metrics, aligning SkyWalking with OTLP/HTTP exporters commonly used by mobile/web clients.

Changes:

• Register new Armeria OTLP/HTTP endpoints: POST /v1/traces, POST /v1/logs, POST /v1/metrics supporting application/x-protobuf and application/json.
• Refactor trace/log gRPC handlers to share processing logic with HTTP handlers via processExport(...).
• Update docs/changelog and bump apache/skywalking-infra-e2e workflow action SHA.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
oap-server/server-receiver-plugin/otel-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/otel/otlp/OpenTelemetryTraceHandler.java	Registers HTTP trace handler and extracts shared processExport() for gRPC/HTTP.
oap-server/server-receiver-plugin/otel-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/otel/otlp/OpenTelemetryTraceHTTPHandler.java	Implements /v1/traces OTLP/HTTP handler (protobuf + JSON).
oap-server/server-receiver-plugin/otel-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/otel/otlp/OpenTelemetryMetricHandler.java	Registers HTTP metrics handler alongside existing gRPC handler.
oap-server/server-receiver-plugin/otel-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/otel/otlp/OpenTelemetryMetricHTTPHandler.java	Implements /v1/metrics OTLP/HTTP handler (protobuf + JSON).
oap-server/server-receiver-plugin/otel-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/otel/otlp/OpenTelemetryLogHandler.java	Registers HTTP log handler and extracts shared processExport() for gRPC/HTTP.
oap-server/server-receiver-plugin/otel-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/otel/otlp/OpenTelemetryLogHTTPHandler.java	Implements /v1/logs OTLP/HTTP handler (protobuf + JSON).
docs/en/setup/backend/otlp-trace.md	Documents OTLP/HTTP trace endpoint and content types.
docs/en/changes/changes.md	Adds changelog entry for OTLP/HTTP support.
.github/workflows/skywalking.yaml	Bumps apache/skywalking-infra-e2e action SHA.

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