Dockerization of telemetry (imperfect but working locally running des…

…ign)

README.md

@@ -270,6 +270,8 @@ To minimize redundancy in validation messages, messages are uniquely indexed in
 
 The web service may be monitored for OpenTelemetry by setting an environment variable **TELEMETRY_ENDPOINT**  to a suitable trace collecting endpoint in an application like [Jaeger](https://www.jaegertracing.io/) (see also the [Translator SRI Jaeger-Demo](https://github.com/TranslatorSRI/Jaeger-demo)).
 
+**Note:** the current system Docker (Compose) design only supports OpenTemplate tracing using the internal Jaeger container and may require further refinements to enable use of an external telemetry collector.
+
 ### Running the Web Service within Docker
 
 The Reasoner Validator web service may be run inside a docker container, using Docker Compose.

api/main.py

@@ -16,6 +16,7 @@
 from reasoner_validator.validator import TRAPIResponseValidator
 
 telemetry_endpoint: Optional[str] = getenv("TELEMETRY_ENDPOINT")
+print(f"Telemetry endpoint: {str(telemetry_endpoint)}", file=stderr)
 
 SERVICE_NAME = "reasoner-validator"
 

docker-compose.yaml

@@ -3,5 +3,15 @@ services:
   api:
     build:
       context: .
+    environment:
+      - TELEMETRY_ENDPOINT=http://jaeger:4318/v1/traces
     ports:
     - "80:80"
+  jaeger:
+    image: jaegertracing/all-in-one:latest
+    ports:
+      - "16686:16686"
+      - "4318:4318"
+      - "6831:6831"
+    environment:
+      - LOG_LEVEL=debug