rm-hull / next-departures-api / 25230759341

Pull #9

github

feat: add prometheus metrics for siri client

Implement instrumentation for the SIRI API client to monitor external
service dependencies. This allows for better observability into the
performance and reliability of the TransportAPI integration.

The following metrics are now collected:
- **Request Latency**: Histogram of HTTP response times for SIRI
  requests.
- **Status Codes**: Counter of HTTP response statuses (success/error).
- **Items Fetched**: Counter tracking the total number of monitored
  stop visits retrieved.

```mermaid
sequenceDiagram
    participant C as SiriClient
    participant M as SiriMetrics
    participant API as TransportAPI

    Note over C, M: Start request timer
    C->>API: GET /stop-monitoring
    API-->>C: XML Response
    C->>M: RecordHttpCall (latency, status)

    Note over C: Parse XML body
    C->>M: RecordFetchedItems (count)
```

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