Add otel-plugin-nginx, otel-cpp

- Adds opentelemetry-cpp: c++ client for otel (dependency for
  otel-plugin-nginx).
- Adds otel-plugin-nginx
- Modifies protobuf to disable generation of libupb. This is a static
  internal dependency of protobuf. If this ends up being load bearing
  for php and python protobuf packages, we should repackage this into a
  subpackage.

opentelemetry-cpp.yaml

@@ -0,0 +1,56 @@
+package:
+  name: opentelemetry-cpp
+  version: 1.16.1
+  epoch: 0
+  description: The OpenTelemetry C++ Client
+  copyright:
+    - license: Apache-2.0
+
+environment:
+  contents:
+    packages:
+      - abseil-cpp-dev
+      - benchmark-dev
+      - busybox
+      - c-ares-dev
+      - cmake
+      - gcc
+      - glibc-dev
+      - grpc-dev
+      - gtest-dev
+      - icu-dev
+      - make
+      - openssl-dev
+      - pkgconf
+      - protobuf-dev
+      - re2-dev
+      - systemd-dev
+
+pipeline:
+  - uses: git-checkout
+    with:
+      repository: https://github.com/open-telemetry/opentelemetry-cpp
+      tag: v${{package.version}}
+      expected-commit: baecbb95bd63df53e0af16e87bc683967962c5f8
+
+  - runs: |
+      mkdir build
+      cd build
+      cmake -DCMAKE_POSITION_INDEPENDENT_CODE=ON -DBUILD_SHARED_LIBS=ON -DWITH_OTLP_GRPC=ON -DWITH_ABSEIL=ON ..
+      cmake --build . --target all
+      cmake --install . --prefix ${{targets.contextdir}}/usr
+
+  - uses: strip
+
+update:
+  enabled: true
+  github:
+    identifier: open-telemetry/opentelemetry-cpp
+    strip-prefix: v
+
+test:
+  pipeline:
+    # AUTOGENERATED
+    - runs: |
+        otelcol --version
+        otelcol --help

opentelemetry-plugin-nginx.yaml

@@ -0,0 +1,125 @@
+#nolint:valid-pipeline-git-checkout-tag
+package:
+  name: opentelemetry-plugin-nginx
+  version: 0_git20241008
+  epoch: 0
+  description: Adds OpenTelemetry distributed tracing support to nginx.
+  copyright:
+    - license: Apache-2.0
+  dependencies:
+    runtime:
+      - opentelemetry-cpp
+
+environment:
+  contents:
+    packages:
+      - abseil-cpp-dev
+      - busybox
+      - c-ares-dev
+      - cmake
+      - curl-dev
+      - gcc
+      - glibc-dev
+      - grpc-dev
+      - icu-dev
+      - make
+      - nginx
+      - opentelemetry-cpp
+      - pcre-dev
+      - protobuf-c-dev
+      - protobuf-dev
+      - re2-dev
+      - systemd-dev
+
+pipeline:
+  - uses: git-checkout
+    with:
+      repository: https://github.com/open-telemetry/opentelemetry-cpp-contrib
+      branch: main
+      expected-commit: f6d29426ee9b4d6b476c09ca3cb9bed3cf23906f
+
+  - runs: |
+      cd instrumentation/nginx
+
+      mkdir build
+      cd build
+      cmake ..
+      make
+
+      mkdir -p ${{targets.contextdir}}/usr/share/nginx/modules
+      cp -p otel_ngx_module.so ${{targets.contextdir}}/usr/share/nginx/modules/
+
+  - uses: strip
+
+update:
+  enabled: true
+  git: {}
+  schedule:
+    period: weekly
+    reason: shared contrib repo that doesn't maintain tags for this component
+
+test:
+  environment:
+    contents:
+      packages:
+        - nginx
+  pipeline:
+    - uses: git-checkout
+      with:
+        repository: https://github.com/open-telemetry/opentelemetry-cpp-contrib
+        branch: main
+        expected-commit: f6d29426ee9b4d6b476c09ca3cb9bed3cf23906f
+    - runs: |
+        cat <<EOF > /etc/nginx/nginx.conf
+        load_module /usr/share/nginx/modules/otel_ngx_module.so;
+
+        user nobody;
+
+        http {
+          opentelemetry_config /etc/nginx/otel-nginx.toml;
+
+          server {
+            listen 80;
+            server_name otel_example;
+
+            root /var/www/html;
+
+            location = / {
+              opentelemetry_operation_name my_example_backend;
+              opentelemetry_propagate;
+              proxy_pass http://localhost:3500/;
+            }
+          }
+        }
+        events {}
+        EOF
+
+        cat <<EOF > /etc/nginx/otel-nginx.toml
+        exporter = "otlp"
+        processor = "batch"
+
+        [exporters.otlp]
+        # Alternatively the OTEL_EXPORTER_OTLP_ENDPOINT environment variable can also be used.
+        host = "localhost"
+        port = 4317
+
+        [processors.batch]
+        max_queue_size = 2048
+        schedule_delay_millis = 5000
+        max_export_batch_size = 512
+
+        [service]
+        # Can also be set by the OTEL_SERVICE_NAME environment variable.
+        name = "nginx-proxy" # Opentelemetry resource name
+
+        [sampler]
+        name = "AlwaysOn" # Also: AlwaysOff, TraceIdRatioBased
+        ratio = 0.1
+        parent_based = false
+        EOF
+
+        # Not sure why this isn't included in main package.
+        mkdir -p /var/lib/nginx/tmp/
+    # -T: test the configuration file: nginx checks the configuration for correct syntax, and then tries to open files referred in the configuration.
+    # additionally dump configuration files to standard output (1.9.2).
+    - runs: nginx -T

protobuf.yaml

@@ -1,7 +1,7 @@
 package:
   name: protobuf
   version: 3.27.4
-  epoch: 0
+  epoch: 1
   description: Library for extensible, efficient structure packing
   copyright:
     - license: BSD-3-Clause
@@ -47,7 +47,8 @@ pipeline:
         -DBUILD_SHARED_LIBS=True \
         -DCMAKE_BUILD_TYPE=Release \
         -Dprotobuf_ABSL_PROVIDER=package \
-        -Dprotobuf_BUILD_TESTS=OFF
+        -Dprotobuf_BUILD_TESTS=OFF \
+        -Dprotobuf_BUILD_LIBUPB=OFF
       ninja -C build
       DESTDIR=${{targets.destdir}} ninja -C build install
 
@@ -107,6 +108,16 @@ subpackages:
           mkdir -p "${{targets.subpkgdir}}"/usr/lib
           mv ${{targets.destdir}}/usr/lib/libprotobuf-lite.so.* ${{targets.subpkgdir}}/usr/lib/
 
+  - name: protobuf-upb
+    description: Protocol Buffers upb library
+    dependencies:
+      runtime:
+        - protobuf
+    pipeline:
+      - runs: |
+          cd upb
+          mkdir -p "${{targets.subpkgdir}}"/usr/lib
+
 update:
   enabled: true
   github:
@@ -127,15 +138,3 @@ test:
   pipeline:
     - runs: |
         protoc --help
-        protoc-gen-upb --version
-        protoc-gen-upb --help
-        protoc-gen-upb-27.4.0 --version
-        protoc-gen-upb-27.4.0 --help
-        protoc-gen-upb_minitable --version
-        protoc-gen-upb_minitable --help
-        protoc-gen-upb_minitable-27.4.0 --version
-        protoc-gen-upb_minitable-27.4.0 --help
-        protoc-gen-upbdefs --version
-        protoc-gen-upbdefs --help
-        protoc-gen-upbdefs-27.4.0 --version
-        protoc-gen-upbdefs-27.4.0 --help