Release 2.19.04

Fixed a bug that was leading to support bundle creation timing out before the Services machine logs had been created, leaving only Replicated logs.
S3 connection pool metrics under circle.s3.connection_pool.* have been added to the test results service, making it easier to debug issues with this service.
Add in missing environment variables for the workflows service. The absence of these environment variables was causing excessive stack tracing whenever workflows were run. This in turn lead to excessive log rotation.
Fixed a bug that was causing failure to update GitHub statuses. Some customers experienced this bug when a project had a follower with a broken auth token.

If any changes have been made to your networking configuration from the default, you should run the following steps to ensure you can use SSH to inspect your builds:
- For customers using AWS, make sure that you have the latest Launch Configuration configured for Nomad clients, and that exiting Nomad clients were spun up using the Launch Configuration.
- On each Nomad Client machine, create /etc/circleci/public-ipv4
- This file should contain the public (if aplicable) or private IP of the nomad client

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