Update docker image in examples/demo from 0.88.0 to 0.116.1 (Closes #…

…37031) (#37063)

Update docker image and collector configuration in examples/demo to keep
metrics working on port 8888

*The gap between versions 0.88.0 and 0.116.1 is widening*

<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
#### Description

Update docker image used in the example from
otel/opentelemetry-collector:**0.88.0** to
otel/opentelemetry-collector:**0.116.1**. This update requires some
changes to the collector configuration (otel-collector-config.yaml) due
to a breaking change in the collector. In version 0.116.1, the collector
no longer exposes configurations on 0.0.0.0 by default.

Collector configuration to keep metrics working on port 8888

```
  telemetry:
    metrics:
      readers:
        - pull:
            exporter:
              prometheus:
                host: '0.0.0.0'
                port: 8888
```

<!-- Issue number (e.g. #1234) or full URL to issue, if applicable. -->
#### Link to tracking issue
Closes #37031

<!--Describe what testing was performed and which tests were added.-->
#### Testing

- Traces are exactly the same in Jaeger after updating the image/config
- Traces are exactly the same in Zipkin after updating the image/config
- Metrics endpoint 8889 is working /metrics
- Metrics endpoint 8888 is working /metrics (after adjustment in the
collector at service/telemetry/metrics/readers)
<!--Describe the documentation added.-->

```
cd examples/demo/ && docker compose up
```
✔️ All services are up and running
✔️ Metric logs are visible
✔️ Trace logs are visible
✔️ Client and server tracing are available in both Zipkin and Jaeger

```
otel-collector-1     | 2025-01-07T10:43:29.029Z info    Traces  {"kind": "exporter", "data_type": "traces", "name": "debug", "resource spans": 1, "spans": 8}
otel-collector-1     | 2025-01-07T10:43:29.029Z info    Metrics {"kind": "exporter", "data_type": "metrics", "name": "debug", "resource metrics": 1, "metrics": 7, "data points": 7}
```

---------

Co-authored-by: Curtis Robert <[email protected]>

examples/demo/docker-compose.yaml

@@ -21,9 +21,9 @@ services:
 
   # Collector
   otel-collector:
-    image: ${OTELCOL_IMG}
+    image: otel/opentelemetry-collector:0.116.1
     restart: always
-    command: ["--config=/etc/otel-collector-config.yaml", "${OTELCOL_ARGS}"]
+    command: ["--config=/etc/otel-collector-config.yaml"]
     volumes:
       - ./otel-collector-config.yaml:/etc/otel-collector-config.yaml
     ports:

examples/demo/otel-collector-config.yaml

@@ -42,3 +42,11 @@ service:
       receivers: [otlp]
       processors: [batch]
       exporters: [debug, prometheus]
+  telemetry:
+    metrics:
+      readers:
+        - pull:
+            exporter:
+              prometheus:
+                host: '0.0.0.0'
+                port: 8888