Please deprecate the 'fastmodinsert' slow diagnostic log and profiler metric for MongoDB 3.4.

fastmodinsert does not appear to be referenced in our current documentation (please double check). If not, a suggestion for deprecation would be:

1. Add to https://docs.mongodb.org/manual/reference/database-profiler/
2. Mark as deprecated on this page

My working definition for fastmodinsert is:

Records the # of update operations that match all of the following criteria:

1. Result in an insert operation (is an upsert).
2. Does not use modifier operations like $set (so would have replaced the entire document if an update rather than insert).