Fix example/grafana-integration (#4980)

## Which problem is this PR solving?

Currently, the `grafana-integration` example doesn't work properly: if
you run `docker-compose up` in that folder, services will start but only
logging will work, the metrics and tracing won't.

## Description of the changes

* Fix traces endpoint config for hotrod (`traces export: Post
"http://localhost:4318/v1/traces": dial tcp 127.0.0.1:4318: connect:
connection refused`)
* Fix hotrod metrics scraping (endpoint has moved to the frontend
service)
* Pin Jaeger/hotrod tags to prevent future issues
* Fix Grafana dashboard (metric names, labels, migrate to new time
series panel)
* Add default Grafana credentials to README
* Fix the loki container being stuck on shutdown by setting shorter
timeouts (bug with the driver:
grafana/loki#2361 (comment))
* Update Grafana/Loki/Prom pinned versions (especially to get Grafana UI
improvements)

## How was this change tested?

`docker-compose up` 🙂 

<img width="2304" alt="SCR-20231201-cohy"
src="https://github.com/jaegertracing/jaeger/assets/11699655/22016bd9-0f99-40c7-be18-eb733561572a">
<img width="2304" alt="SCR-20231201-cxos"
src="https://github.com/jaegertracing/jaeger/assets/11699655/db761bc3-53ac-41fa-914d-803c73233ad7">
<img width="2304" alt="SCR-20231201-coke"
src="https://github.com/jaegertracing/jaeger/assets/11699655/004c99f0-0d1f-46f1-a9da-f50f0148d377">

## Checklist
- [x] I have read
https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
- [x] I have signed all commits
- [ ] I have added unit tests for the new functionality
- [ ] I have run lint and test steps successfully
  - for `jaeger`: `make lint test`
  - for `jaeger-ui`: `yarn lint` and `yarn test`

Signed-off-by: Stanislas Lange <git@slange.me>

examples/grafana-integration/README.md

@@ -20,11 +20,11 @@ grafana/loki-docker-driver:latest \
 
 ### Run the services
 
-`docker-compose up` 
+`docker-compose up`
 
 ### Access the services
 * HotROD application at http://localhost:8080
-* Grafana UI at http://localhost:3000
+* Grafana UI at http://localhost:3000 (default credentials: admin/admin)
 
 ### Explore with Loki
 

examples/grafana-integration/docker-compose.yaml

@@ -2,7 +2,7 @@ version: '2'
 
 services:
   grafana:
-    image: grafana/grafana:7.1.4
+    image: grafana/grafana:10.2.2
     ports:
       - '3000:3000'
     volumes:
@@ -15,7 +15,7 @@ services:
         loki-url: 'http://localhost:3100/api/prom/push'
 
   loki:
-    image: grafana/loki:master
+    image: grafana/loki:2.9.2
     ports:
       - '3100:3100'
     command: -config.file=/etc/loki/local-config.yaml
@@ -29,9 +29,14 @@ services:
       driver: loki
       options:
         loki-url: 'http://localhost:3100/api/prom/push'
+        # Prevent container from being stuck when shutting down
+        # https://github.com/grafana/loki/issues/2361#issuecomment-718024318
+        loki-timeout: 1s
+        loki-max-backoff: 1s
+        loki-retries: 1
 
   jaeger:
-    image: jaegertracing/all-in-one:latest
+    image: jaegertracing/all-in-one:1.51
     ports:
       - '6831:6831'
       - '16686:16686'
@@ -41,27 +46,26 @@ services:
         loki-url: 'http://localhost:3100/api/prom/push'
 
   hotrod:
-    image: jaegertracing/example-hotrod:latest
+    image: jaegertracing/example-hotrod:1.51
     ports:
       - '8080:8080'
       - '8083:8083'
     command: ["-m","prometheus","all"]
     environment:
-      - JAEGER_AGENT_HOST=jaeger
-      - JAEGER_AGENT_PORT=6831
+      - OTEL_EXPORTER_OTLP_ENDPOINT=http://jaeger:4318
     logging:
       driver: loki
       options:
         loki-url: 'http://localhost:3100/api/prom/push'
 
   prometheus:
-    image: prom/prometheus:v2.19.1
+    image: prom/prometheus:v2.48.0
     volumes:
       - ./prometheus/prometheus.yml:/etc/prometheus/prometheus.yml:ro
     ports:
       - '9090:9090'
     command:
-    - --config.file=/etc/prometheus/prometheus.yml
+      - --config.file=/etc/prometheus/prometheus.yml
     logging:
       driver: loki
       options: