add basic Grafana integration setup and README.md

Signed-off-by: fktkrt <fktkrt@gmail.com>

examples/grafana-integration/README.md

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+# Hot R.O.D. - Rides on Demand  - Grafana integration
+
+This is the Hot R.O.D. demo application that consists of the same components as the `examples/hotrod/`, only Grafana and Loki integration is added to this setup, so you can corralete metrics, logs and traces in one application.
+
+## Running
+
+### Run everything via `docker-compose`
+
+* Download `docker-compose.yml` from https://github.com/jaegertracing/jaeger/blob/master/examples/grafana-integration/docker-compose.yml
+* Download the `datasources.yaml` from the `examples/grafana-integration/` folder
+* Run Grafana and Loki integration with Jaeger backend using HotROD demo with `docker-compose -f path-to-yml-file up`
+* Access Grafana UI at http://localhost:3000 and HotROD app at http://localhost:8080
+* Shutdown / cleanup with `docker-compose -f path-to-yml-file down`
+

examples/grafana-integration/datasources.yaml

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+ApiVersion: 1
+
+datasources:
+  - name: Loki
+    type: loki
+    access: proxy
+    url: http://loki:3100
+    editable: true
+    isDefault: true
+  - name: Jaeger
+    type: jaeger
+    access: browser
+    url: http://jaeger:16686
+    editable: true

examples/grafana-integration/docker-compose.yaml

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+All services will log to Loki via the loki docker logging plugin.
+# To install run this on the host once:
+# docker plugin install grafana/loki-docker-driver:latest --alias loki --grant-all-permissions
+version: '2'
+services:
+  grafana:
+    image: grafana/grafana:7.1.4
+    ports:
+      - '3000:3000'
+    volumes:
+      - ./datasources.yaml:/etc/grafana/provisioning/datasources/datasources.yaml
+    logging:
+      driver: loki
+      options:
+        loki-url: 'http://localhost:3100/api/prom/push'
+
+  loki:
+    image: grafana/loki:master
+    ports:
+      - '3100:3100'
+    command: -config.file=/etc/loki/local-config.yaml
+    environment:
+      - JAEGER_AGENT_HOST=jaeger
+      - JAEGER_AGENT_PORT=6831
+      - JAEGER_SAMPLER_TYPE=const
+      - JAEGER_SAMPLER_PARAM=1
+    logging:
+      driver: loki
+      options:
+        loki-url: 'http://localhost:3100/api/prom/push'
+
+  jaeger:
+    image: jaegertracing/all-in-one:latest
+    ports:
+      - '6831:6831'
+      - '16686:16686'
+    logging:
+      driver: loki
+      options:
+        loki-url: 'http://localhost:3100/api/prom/push'
+
+  hotrod:
+    image: jaegertracing/example-hotrod:latest
+    ports:
+      - "8080:8080"
+    command: ["all"]
+    environment:
+      - JAEGER_AGENT_HOST=jaeger
+      - JAEGER_AGENT_PORT=6831
+    logging:
+      driver: loki
+      options:
+        loki-url: 'http://localhost:3100/api/prom/push'
+