Breadcrumbs cause OOM

[samoylovfp]

When something bad happens on server and we get several exceptions per second - breadcrumbs can grow and cause process to OOM while trying to send these exceptions.
Example of mesage from raven to sentry:
https://gist.github.com/samoylovfp/29e8b863ce19bc5e999cb54ad0d0f41e

There should be some way of limiting maximum size of breadcrumbs array or size of outgoing message body.

[codewarrior0]

Might be related - I looked at the breadcrumb integration for the logging module, and it seems to retain the args, kwargs arguments given to the logging call, as part of the closure for the inner processor() function in _record_log_breadcrumb(). Kind of becomes a problem when I logged objects that are part of a large object graph, so the breadcrumb list ended up keeping big chunks of the graph in memory even after the rest of my program no longer retains them.

[tgs]

Interesting @codewarrior0 - that would be a particularly subtle problem if someone logs the results of XPath queries using lxml, since those act like strings, but keep the entire XML object graph in memory.