Since the earliest days of edX, we've run gunicorn with preload_app as
True. This was primarily because the first handful of courses were using
the XMLModuleStore, which was extremely slow to initialize because it
had to read entire courses from disk and load them into memory at
startup.

XMLModuleStore courses stopped being created with the introduction of
Studio, and we've long since removed them from edx.org. Note: This
should not be confused with importing courses that are authored in XML.
XMLModuleStore courses are courses who use the disk instead of Mongo
for content persistence, and require a server restart for content edits
to show.

This commit sets things back to how Django is more commonly deployed
with gunicorn. It will make server startup time somewhat more expensive
because each worker process does init work, but it should make it
easier to safely enable features like database connection pooling
without having to worry about shared resources.

[PERF-305]

removing unneeded, missing alternatives

bad diag

missed var

Add newrelic to jenkins workers.

Deploy edx-themes:master instead of edx-themes:release

We want the release pipelines to deploy edx-themes:master to avoid
the additional step of merging edx-themes:master to edx-themes:release
in order to deploy changes to edx-themes.

WL-1018

This Dockerfile is based on the official image (rather than built from scratch by us) and includes the elasticsearch-head plugin.

ECOM-7552

No need to create different replica user

find-exec won't expand wildcards

Exclude Enterprise API from auth.

ubuntu-restricted-extras requires multiverse

Configure ca-certificates for java in go-agents

Add a playbook to install Grafana.

This is not enabled by default, enable it for machines using the
browsers role.

This is missing on the newest docker images

move oraclejdk into relasticsearch role

From resurrecting old docker images, it appears that we got it for
"free" as part of the jenkins container, but don't have it now that
we're starting from a clean install.

Always autorestart edxapp workers

Don't check virtual memory in YARN_SITE_DEFAULT_CONFIG.

We've run this against two hosts by manually hacking run_role.yml

This helps make it simpler until we write the ansible to support
playbooks that don't gather facts, bootstrap, gather facts, run the
other role.

Remove the specific version AMI version tagging in favor of using the version_tags variable

Only run the generic AMI tagging task when there are tags to apply

Allow custom version tags to be applied when creating an AMI

Use INSIGHTS_DATABASE variables in edxlocal role

The INSIGHTS_MYSQL_USER variable is not defined, so the Insights database user was not being created.