breymander commented on issue #8789:
URL:
https://github.com/apache/incubator-devlake/issues/8789#issuecomment-4112258256
**Root Cause**
Figured out what's going on. On first run, `computeReportDateRange` in
`report_download_helper.go` iterates 365 days back (`reportMaxDays = 365`), but
the Copilot Usage Metrics Reports API only has data going back to around
October 2025. For dates before that, GitHub doesn't return a `404` — it returns
a `200` with body `""`:
```
HTTP 200
Content-Length: 3
""
```
The `ignore404` callback in `report_download_helper.go` only handles 404s,
so this 200 passes straight through to the `ResponseParser` in
`org_metrics_collector.go`, which does:
```go
var meta reportMetadataResponse
if jsonErr := json.Unmarshal(body, &meta); jsonErr != nil {
return nil, errors.Default.Wrap(jsonErr, "failed to parse report
metadata")
}
```
Unmarshaling `""` into a struct fails, and the framework wraps it as the
generic "error parsing response" message.
**Suggested fix:** Check for empty/non-object bodies (`""`, `null`, empty)
before the unmarshal and skip the day instead of erroring out. Same issue
applies to `user_metrics_collector.go` and `enterprise_metrics_collector.go`.
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