access_log: add OTLP/HTTP exporter to OpenTelemetry access logger by codefromthecrypt · Pull Request #42445 · envoyproxy/envoy

codefromthecrypt · 2025-12-07T00:12:39Z

Commit Message: access_log: add OTLP/HTTP exporter to OpenTelemetry access logger

Additional Description: Adds HTTP transport support to the OpenTelemetry access logger, complementing #29207 (OTLP/HTTP tracing). This enables direct OTLP log export to backends that only accept HTTP (Dynatrace, Datadog, Logfire), without requiring an intermediate collector sidecar.

Also refactors the config to match the tracer pattern:

Add top-level http_service field for OTLP/HTTP transport
Add top-level grpc_service and log_name fields
Deprecate common_config field (still functional for backward compatibility)
Extract shared utilities (otlp_log_utils) for HTTP and gRPC implementations

Risk Level: Low (new optional feature, backward compatible)

Testing: Unit tests, integration test, manual testing with OTel collector

Docs Changes: Proto documentation updated

Release Notes: Added

Fixes #26352 (access logs portion)

Example Configuration (OTLP/HTTP with resource_attributes)

access_log:
- name: envoy.access_loggers.open_telemetry
  typed_config:
    "@type": type.googleapis.com/envoy.extensions.access_loggers.open_telemetry.v3.OpenTelemetryAccessLogConfig
    http_service:
      http_uri:
        uri: "http://localhost:4318/v1/logs"
        cluster: otel_collector
        timeout: 1s
    log_name: envoy_access_log
    resource_attributes:
      values:
      - key: "service.name"
        value:
          string_value: "my-service"
    body:
      string_value: "%REQ(:METHOD)% %REQ(:PATH)% %RESPONSE_CODE%"

Example Configuration (OTLP/gRPC - top-level field)

access_log:
- name: envoy.access_loggers.open_telemetry
  typed_config:
    "@type": type.googleapis.com/envoy.extensions.access_loggers.open_telemetry.v3.OpenTelemetryAccessLogConfig
    grpc_service:
      envoy_grpc:
        cluster_name: otel_collector
    log_name: envoy_access_log
    body:
      string_value: "%REQ(:METHOD)% %REQ(:PATH)% %RESPONSE_CODE%"

Screenshots

repokitteh-read-only · 2025-12-07T00:12:45Z

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🐱

Caused by: #42445 was opened by codefromthecrypt.

see: more, trace.

repokitteh-read-only · 2025-12-07T00:12:50Z

CC @envoyproxy/api-shepherds: Your approval is needed for changes made to (api/envoy/|docs/root/api-docs/).
envoyproxy/api-shepherds assignee is @mattklein123
CC @envoyproxy/api-watchers: FYI only for changes made to (api/envoy/|docs/root/api-docs/).

🐱

Caused by: #42445 was opened by codefromthecrypt.

see: more, trace.

codefromthecrypt · 2025-12-07T03:51:38Z

@wbpcode @Kludex fyi this is for extending otel logging from grpc-only in envoy to also http as many backends prefer or only support http OTLP

codefromthecrypt · 2025-12-07T06:18:52Z

configs/envoy-otel-http.yaml

+              resource_detectors:
+              - name: envoy.tracers.opentelemetry.resource_detectors.environment
+                typed_config:
+                  "@type": type.googleapis.com/envoy.extensions.tracers.opentelemetry.resource_detectors.v3.EnvironmentResourceDetectorConfig


ok this now uses the current practice with is resource detectors, not a one-off, even though the one-off in grpc+accesslog is retained for deprecation

codefromthecrypt · 2025-12-10T04:16:29Z

noticed other examples use httpbingo not httpbin, since no one has reviewed yet I switched to the former and updated the screenshots🤞

codefromthecrypt · 2025-12-11T10:42:39Z

@TAOXUY this might be interesting to you. I'm happy to continue and do metrics after this once merged

yanavlasov · 2026-01-06T16:08:20Z

Thanks for working on this @codefromthecrypt Please merge main.

Would it be possible to make test/extensions/access_loggers/open_telemetry/access_log_integration_test.cc test both HTTP and gRPC exporter? This will make it easier to reason that two exporters behave the same.

/wait

codefromthecrypt · 2026-01-08T08:54:15Z

@yanavlasov added a commit that I think gets what you are saying. thanks for the tip

codefromthecrypt · 2026-01-08T11:35:36Z

test/extensions/access_loggers/open_telemetry/access_log_integration_test.cc

-                                 public HttpIntegrationTest {
+enum class ExporterType { GRPC, HTTP };
+
+struct TransportDriver {


wasn't quite sure style, but this is how I was thinking about parameterizing so it is easy to see if these behave the same except the different parts. thanks for the idea @yanavlasov as it found a bug I fixed!

Signed-off-by: Adrian Cole <adrian@tetrate.io>

yanavlasov · 2026-01-10T00:42:25Z

LGTM. Will wait for @mattklein123 for API review.

/wait-any

wbpcode

LGTM. Thanks.

Adds HTTP transport support to the OpenTelemetry metrics sink, complementing envoyproxy#42445 (OTLP/HTTP access logs) and envoyproxy#29207 (OTLP/HTTP tracing. This enables direct OTLP metrics export to backends that only accept HTTP (Dynatrace, Datadog, Elastic), without requiring an intermediate collector sidecar. - Add field to oneof - Create abstract base class - Rename to EOF ) Signed-off-by: Adrian Cole <adrian@tetrate.io>

codefromthecrypt · 2026-01-14T12:18:33Z

thanks all #43001 completes the otlp http transport by supporting metrics (we already supported traces, and this PR did access logs, only left was metrics)

Adds HTTP transport support to the OpenTelemetry metrics sink, complementing envoyproxy#42445 (OTLP/HTTP access logs) and envoyproxy#29207 (OTLP/HTTP tracing. This enables direct OTLP metrics export to backends that only accept HTTP (Dynatrace, Datadog, Elastic), without requiring an intermediate collector sidecar. - Add field to oneof - Create abstract base class - Rename to EOF ) Signed-off-by: Adrian Cole <adrian@tetrate.io>

**Description** Switches OTLP default transport from HTTP to gRPC in test fixtures and examples. This prepares for Envoy Gateway integration which currently only supports OTLP/gRPC for access logs. Once Envoy Gateway exposes OTLP/HTTP (pending upstream changes in Envoy), we can switch back. **Related Issues/PRs (if applicable)** - envoyproxy/envoy#42445 (OTLP/HTTP access logs in Envoy) - envoyproxy/gateway#7674 (OTLP headers support) Signed-off-by: Adrian Cole <adrian@tetrate.io>

Adds HTTP transport support to the OpenTelemetry metrics sink, complementing envoyproxy#42445 (OTLP/HTTP access logs) and envoyproxy#29207 (OTLP/HTTP tracing. This enables direct OTLP metrics export to backends that only accept HTTP (Dynatrace, Datadog, Elastic), without requiring an intermediate collector sidecar. - Add field to oneof - Create abstract base class - Rename to EOF ) Signed-off-by: Adrian Cole <adrian@tetrate.io>

@type

) **Additional Description**: Adds HTTP transport support to the OpenTelemetry metrics sink, complementing #42445 (OTLP/HTTP access logs) and #29207 (OTLP/HTTP tracing). This enables direct OTLP metrics export to backends that only accept HTTP (Dynatrace, Datadog, Elastic), without requiring an intermediate collector sidecar. Also refactors the exporter to use an abstract base class: - Add `http_service` field to `protocol_specifier` oneof for OTLP/HTTP transport - Create abstract `OtlpMetricsExporter` base class - Rename `OpenTelemetryGrpcSink` to `OpenTelemetrySink` with generic exporter **Risk Level**: Low (new optional feature, backward compatible) **Testing**: Unit tests, integration test, manual testing with OTel collector **Docs Changes**: Proto documentation updated **Release Notes**: Added **Example Configuration (OTLP/HTTP)** ```yaml stats_sinks: - name: envoy.stat_sinks.open_telemetry typed_config: "@type": type.googleapis.com/envoy.extensions.stat_sinks.open_telemetry.v3.SinkConfig http_service: http_uri: uri: "http://localhost:4318/v1/metrics" cluster: otel_collector timeout: 1s report_counters_as_deltas: true report_histograms_as_deltas: true emit_tags_as_attributes: true use_tag_extracted_name: true ``` **Example Configuration (OTLP/gRPC - unchanged)** ```yaml stats_sinks: - name: envoy.stat_sinks.open_telemetry typed_config: "@type": type.googleapis.com/envoy.extensions.stat_sinks.open_telemetry.v3.SinkConfig grpc_service: envoy_grpc: cluster_name: otel_collector report_counters_as_deltas: true ``` Screenshot of metrics from http transport in otel-tui <img width="1288" height="734" alt="Screenshot 2026-01-14 at 8 46 27 PM" src="https://github.com/user-attachments/assets/49d57f12-61a4-4b0d-9dbc-8b9ad3339554" /> --------- Signed-off-by: Adrian Cole <adrian@tetrate.io> Signed-off-by: Adrian Cole <64215+codefromthecrypt@users.noreply.github.com> Signed-off-by: code <wbphub@gmail.com> Signed-off-by: wbpcode/wangbaiping <wbphub@gmail.com> Co-authored-by: code <wbphub@gmail.com>

@type

…oyproxy#43001) **Additional Description**: Adds HTTP transport support to the OpenTelemetry metrics sink, complementing envoyproxy#42445 (OTLP/HTTP access logs) and envoyproxy#29207 (OTLP/HTTP tracing). This enables direct OTLP metrics export to backends that only accept HTTP (Dynatrace, Datadog, Elastic), without requiring an intermediate collector sidecar. Also refactors the exporter to use an abstract base class: - Add `http_service` field to `protocol_specifier` oneof for OTLP/HTTP transport - Create abstract `OtlpMetricsExporter` base class - Rename `OpenTelemetryGrpcSink` to `OpenTelemetrySink` with generic exporter **Risk Level**: Low (new optional feature, backward compatible) **Testing**: Unit tests, integration test, manual testing with OTel collector **Docs Changes**: Proto documentation updated **Release Notes**: Added **Example Configuration (OTLP/HTTP)** ```yaml stats_sinks: - name: envoy.stat_sinks.open_telemetry typed_config: "@type": type.googleapis.com/envoy.extensions.stat_sinks.open_telemetry.v3.SinkConfig http_service: http_uri: uri: "http://localhost:4318/v1/metrics" cluster: otel_collector timeout: 1s report_counters_as_deltas: true report_histograms_as_deltas: true emit_tags_as_attributes: true use_tag_extracted_name: true ``` **Example Configuration (OTLP/gRPC - unchanged)** ```yaml stats_sinks: - name: envoy.stat_sinks.open_telemetry typed_config: "@type": type.googleapis.com/envoy.extensions.stat_sinks.open_telemetry.v3.SinkConfig grpc_service: envoy_grpc: cluster_name: otel_collector report_counters_as_deltas: true ``` Screenshot of metrics from http transport in otel-tui <img width="1288" height="734" alt="Screenshot 2026-01-14 at 8 46 27 PM" src="https://github.com/user-attachments/assets/49d57f12-61a4-4b0d-9dbc-8b9ad3339554" /> --------- Signed-off-by: Adrian Cole <adrian@tetrate.io> Signed-off-by: Adrian Cole <64215+codefromthecrypt@users.noreply.github.com> Signed-off-by: code <wbphub@gmail.com> Signed-off-by: wbpcode/wangbaiping <wbphub@gmail.com> Co-authored-by: code <wbphub@gmail.com>

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fix: set OpenTelemetry Tracer/Accesslog default protocol to GRPC envoyproxy/gateway#7694

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codefromthecrypt added 2 commits January 9, 2026 05:56

access_log: add OTLP/HTTP exporter to OpenTelemetry access logger

5ffd9c5

Signed-off-by: Adrian Cole <adrian@tetrate.io>

test-refactor-and-fix

2143126

Signed-off-by: Adrian Cole <adrian@tetrate.io>

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wbpcode merged commit 6718965 into envoyproxy:main Jan 10, 2026
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stat_sinks: add OTLP/HTTP exporter to OpenTelemetry metrics sink #43001

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test: switch OTLP default transport to gRPC in examples envoyproxy/ai-gateway#1774

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access_log: add OTLP/HTTP exporter to OpenTelemetry access logger#42445

access_log: add OTLP/HTTP exporter to OpenTelemetry access logger#42445
wbpcode merged 2 commits intoenvoyproxy:mainfrom
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