See what triggers a fetch

[JCB-K]

I would like to see what triggers a fetch (stale cache, onFocus, refreshInterval, etc) when a request is done. Is there any way to do log this? I have 2 use cases:

• debugging: I see a fetch happen when it shouldn't, and I'd like to see what triggered it.
• for monitoring purposes: I have some data that is updated via websockets, but when no connection can be made via websocket I do a fallback to polling the server by setting refreshInterval. I'd like to send this along as a query param so I can track the split of push vs poll data over time.