feat: Replace Node.js telemetry with Docker (#15)

This change replaces the Node.js-based telemetry setup with a more
streamlined Docker-based approach.

- The `scripts/telemetry.js` and `scripts/telemetry_utils.js` files have
been removed.
- The `action.yml` now uses a Docker container to run the OpenTelemetry
collector.
- A `collector-gcp.yaml.template` file has been added to provide a
configuration for the collector.

Fixes #11
Fixes #14

Thanks to @sethvargo for pairing on this!

Author: jerop

action.yml

@@ -50,15 +50,23 @@ runs:
         project_id: '${{ env.OTLP_GOOGLE_CLOUD_PROJECT }}'
         workload_identity_provider: '${{ env.OTLP_GCP_WIF_PROVIDER }}'
 
-    - name: 'Setup Telemetry Collector for Google Cloud'
+    - name: 'Run Telemetry Collector for Google Cloud'
       if: |-
         ${{ env.OTLP_GCP_WIF_PROVIDER != '' }}
       env:
         OTLP_GOOGLE_CLOUD_PROJECT: '${{ env.OTLP_GOOGLE_CLOUD_PROJECT }}'
         GITHUB_ACTION_PATH: '${{ github.action_path }}'
       shell: 'bash'
       run: |-
-        node "${GITHUB_ACTION_PATH}/scripts/telemetry.js"
+        set -euo pipefail
+        mkdir -p .gemini/
+        sed "s/OTLP_GOOGLE_CLOUD_PROJECT/${OTLP_GOOGLE_CLOUD_PROJECT}/g" "${GITHUB_ACTION_PATH}/scripts/collector-gcp.yaml.template" > ".gemini/collector-gcp.yaml"
+
+        docker run -d --name gemini-telemetry-collector --network host \
+          -v "${GITHUB_WORKSPACE}:/github/workspace" \
+          -e "GOOGLE_APPLICATION_CREDENTIALS=${GOOGLE_APPLICATION_CREDENTIALS/$GITHUB_WORKSPACE//github/workspace}" \
+          -w "/github/workspace" \
+          otel/opentelemetry-collector-contrib:0.128.0
 
     - name: 'Install Gemini CLI'
       id: 'install'

scripts/collector-gcp.yaml.template

@@ -0,0 +1,38 @@
+receivers:
+  otlp:
+    protocols:
+      grpc:
+        endpoint: 'localhost:4317'
+processors:
+  batch:
+    timeout: '1s'
+exporters:
+  googlecloud:
+    project: 'OTLP_GOOGLE_CLOUD_PROJECT'
+    metric:
+      prefix: 'custom.googleapis.com/gemini_cli'
+    log:
+      default_log_name: 'gemini_cli'
+  debug:
+    verbosity: 'detailed'
+    sampling_initial: '2'
+    sampling_thereafter: '500'
+service:
+  telemetry:
+    logs:
+      level: 'debug'
+    metrics:
+      level: 'none'
+  pipelines:
+    traces:
+      receivers: ['otlp']
+      processors: ['batch']
+      exporters: ['googlecloud', 'debug']
+    metrics:
+      receivers: ['otlp']
+      processors: ['batch']
+      exporters: ['googlecloud', 'debug']
+    logs:
+      receivers: ['otlp']
+      processors: ['batch']
+      exporters: ['googlecloud', 'debug']