demo: grpc based remote storage for jaeger collector

Signed-off-by: Arunprasad Rajkumar <ar.arunprasad@gmail.com>

docker-compose/jaeger-promscale-demo/README.md

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+# Hot R.O.D. - Rides on Demand
+
+This is a demo application that consists of several microservices and illustrates
+the use of the OpenTracing API. It can be run standalone, but requires Jaeger backend
+to view the traces. A tutorial / walkthrough is available:
+  * as a blog post [Take OpenTracing for a HotROD ride][hotrod-tutorial],
+  * as a video [OpenShift Commons Briefing: Distributed Tracing with Jaeger & Prometheus on Kubernetes][hotrod-openshift].
+
+## Features
+
+* Discover architecture of the whole system via data-driven dependency diagram
+* View request timeline & errors, understand how the app works
+* Find sources of latency, lack of concurrency
+* Highly contextualized logging
+* Use baggage propagation to
+  * Diagnose inter-request contention (queueing)
+  * Attribute time spent in a service
+* Use open source libraries with OpenTracing integration to get vendor-neutral instrumentation for free
+
+## Running
+
+### Run everything via `docker-compose`
+
+* Download `docker-compose.yml` from https://github.com/timescale/promscale/blob/master/docker-compose/jaeger-promscale-demo/docker-compose.yaml
+* Run Jaeger backend and HotROD demo with `docker-compose -f path-to-yml-file up`
+* Access Jaeger UI at http://localhost:16686 and HotROD app at http://localhost:8080
+* Shutdown / cleanup with `docker-compose -f path-to-yml-file down`
+
+[hotrod-tutorial]: https://medium.com/@YuriShkuro/take-opentracing-for-a-hotrod-ride-f6e3141f7941
+[hotrod-openshift]: https://blog.openshift.com/openshift-commons-briefing-82-distributed-tracing-with-jaeger-prometheus-on-kubernetes/

docker-compose/jaeger-promscale-demo/docker-compose.yaml

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+version: '3.0'
+
+services:
+  db:
+    image: timescale/timescaledb-ha:pg14-latest
+    environment:
+      POSTGRES_PASSWORD: password
+      POSTGRES_USER: postgres
+    # ports:
+    #   - 5432:5432/tcp
+
+  promscale:
+    # TODO: Use docker image with Jaeger gRPC remote store support after 0.14.0 release.
+    image: timescale/promscale:latest
+    restart: on-failure
+    depends_on:
+      - db
+    environment:
+      PROMSCALE_DB_URI: postgres://postgres:password@db:5432/postgres?sslmode=allow
+      PROMSCALE_TRACING_OTLP_SERVER_ADDRESS: ":9202"
+    # ports:
+    #   - 9201:9201/tcp
+    #   - 9202:9202/tcp
+
+  jaeger-query:
+    depends_on:
+      - promscale
+    restart: on-failure
+    image: jaegertracing/jaeger-query:1.37.0
+    environment:
+      SPAN_STORAGE_TYPE: grpc-plugin
+      GRPC_STORAGE_SERVER: promscale:9202
+    ports:
+      - "16686:16686"
+
+  hotrod:
+    depends_on:
+      - jaeger-collector
+    image: jaegertracing/example-hotrod:1.37.0
+    environment:
+      JAEGER_ENDPOINT: http://jaeger-collector:14268/api/traces
+    ports:
+      - "8080-8083:8080-8083"
+
+  jaeger-collector:
+    depends_on:
+      - promscale
+    restart: on-failure
+    image: jaegertracing/jaeger-collector:1.37.0
+    environment:
+      SPAN_STORAGE_TYPE: grpc-plugin
+      GRPC_STORAGE_SERVER: promscale:9202
+    # ports:
+    #   - "6831:6831/udp"
+    #   - "14268:14268"