temporarily remove SR on capa alerts to fix problem submissions (LMS-2474)
Remove unused methods from comment_client
Remove unused *args and **kwargs from perform_request
Use requests library utility method for getting json results
Add more tags to comment_client request metrics

This captures real-time metrics for all of the comment client actions,
segregated by course_id, as well as other small-cardinality fields.

The goal is to be able to detect changes in forum usage, with the goal
of alerting on potential error conditions.
Merge pull request #3105 from edx/adam/hotifx-js

temporarily remove SR on capa alerts to fix problem submissions (LMS-247...
Add datadog metrics logging for django model creates, updates, and deletes
Temporarily disable the bok-choy test that is intermittenly failing
Merge remote-tracking branch 'origin/release' into adam/merge-release-2
AN-167 New chapter on role & skills of data czar and research team
Merge pull request #3038 from edx/ahodges/documentation/dataczar

AN-167 New chapter on role & skills of data czar and research team
Merge pull request #3112 from edx/zoldak/skip-failing-tests

Temporarily disable the bok-choy test that is intermittently failing
Merge pull request #3113 from edx/adam/merge-release-2

Adam/merge release 2
Custom JavaScript Display and Grading

DOC-105
Merge pull request #3006 from edx/markhoeber/documentation/DOC-105

Markhoeber/documentation/doc 105
Disable failing video test
Merge pull request #3114 from edx/zoldak/skip-failing-video-test

Disable failing video test
Merge pull request #3061 from cpennington/model-metrics

Add datadog metrics logging for django model creates, updates, and deletes
Merge pull request #3062 from cpennington/comment-client-metrics

Add metrics to comment_client requests
Fix multiple videos on page

If there are several videos on page, make sure that
the global onYouTubeIframeAPIReady function is properly
setup so that all callbacks are trigerred when the YouTube API
loads.

BLD-972