Errors from Azure API include the whole request, don't parse as JSON

[djmitche]

I spent a bunch of time looking for errors from the Azure API, and eventually found them by removing all filters in StackDriver. They were huge blobs of JSON text that StackDriver wouldn't parse as JSON (because they were too long). This appears to be mostly because they include the entire request object in the error body.

It'd be great to fix this in some systematic way -- I can imagine lots of other errors are also too huge to get registered.

[djmitche]

STR:

• set up an azure worker-manager provider, but don't give the app registration any permissions
• create a worker in a pool using that provider

[djmitche]

I'm thinking of just iteratively removing the largest subkey of Fields until the message fits, but I'm not sure what the maximum line length is.

[djmitche]

Ah, it's 256k - https://cloud.google.com/logging/quotas

[djmitche]

I ended up stripping any non-scalar values from error objects. That should get this pretty comprehensively, with minimal collateral damage.