Create a new otel directory; Add a readme and makefile

otel/Makefile

@@ -0,0 +1,20 @@
+DC=docker-compose -f docker-compose.yaml
+
+.PHONY: help
+.DEFAULT_GOAL := help
+
+help:
+	@grep -E '^[a-zA-Z_-]+:.*?## .*$$' $(MAKEFILE_LIST) | sort | awk 'BEGIN {FS = ":.*?## "}; {printf "\033[36m%-30s\033[0m %s\n", $$1, $$2}'
+
+stop: ## Stop all Docker Containers run in Compose
+	$(DC) stop
+
+clean: stop ## Clean all Docker Containers and Volumes
+	$(DC) down --rmi local --remove-orphans -v
+	$(DC) rm -f -v
+
+build: clean ## Rebuild the Docker Image for use by Compose
+	$(DC) build
+
+run: stop ## Run the Application
+	$(DC) up

otel/README.md

@@ -0,0 +1,37 @@
+# Tracing Demo
+
+The directory contains sample [OpenTelemetry Collector](https://github.com/open-telemetry/opentelemetry-collector)
+and [Jaeger](https://www.jaegertracing.io) configurations for a tracing demo.
+
+## Configuration
+
+The provided [docker-compose.yaml](docker-compose.yaml) sets up 4 Containers
+
+1. PodInfo Frontend on port 9898
+2. PodInfo Backend on port 9899
+3. OpenTelemetry Collector listening on port 4317 for GRPC
+4. Jaeger all-in-one listening on multiple ports
+
+## How does it work?
+
+The frontend pods are configured to call onto the backend pods. Both the podinfo
+pods are configured to send traces over to the collector at port 4317 using GRPC.
+The collector forwards all received spans to Jaeger over port 14250 and Jaeger
+exposes a UI over port `16686`.
+
+## Running it locally
+
+1. Start all the Containers
+```shell
+make run
+```
+2. Send some sample requests
+```shell
+curl -v http://localhost:9898/status/200
+curl -X POST -v http://localhost:9898/api/echo
+```
+3. Visit `http://localhost:16686/` to see the spans
+4. Stop all the containers
+```shell
+make stop
+```

otel/docker-compose.yaml

@@ -2,14 +2,14 @@ version: '2'
 
 services:
   podinfo_frontend:
-    build: .
+    build: ..
     command: ./podinfo --backend-url http://podinfo_backend:9899/status/200 --otel-service-name=podinfo_frontend
     environment:
       - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://otel:4317
     ports:
       - "9898:9898"
   podinfo_backend:
-    build: .
+    build: ..
     command: ./podinfo --port 9899 --otel-service-name=podinfo_backend
     environment:
       - OTEL_EXPORTER_OTLP_TRACES_ENDPOINT=http://otel:4317