[metrics-bugs] #27697 [Metrics/ExoneraTor]: Release ExoneraTor 4.0.0

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#27697: Release ExoneraTor 4.0.0
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     Reporter:  karsten             |      Owner:  metrics-team
         Type:  task                |     Status:  new
     Priority:  Medium              |  Milestone:
    Component:  Metrics/ExoneraTor  |    Version:
     Severity:  Normal              |   Keywords:
Actual Points:                      |  Parent ID:
       Points:                      |   Reviewer:
      Sponsor:                      |
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 #27356 is ready to be deployed. Let's put out ExoneraTor 4.0.0 for this
 major change.

 Here's my deployment plan:
  - Put out the release.
  - Temporarily update m-web to stop making requests to the ExoneraTor
 server and instead display a maintenance notice on the ExoneraTor page.
  - Stop ExoneraTor's web server.
  - Stop ExoneraTor's cronjob.
  - Drop all tables, indexes, and functions until the database is empty.
  - Restore tables, indexes, and functions from the uploaded database dump,
 which is based on a backup from 4 weeks ago that has been migrated and
 updated locally before being uploaded back to the server.
  - Manually check the database.
  - Run the updated cronjob manually.
  - Update and reinstall the cronjob to run once per hour again.
  - Update and start ExoneraTor's web server.
  - Run tests to ExoneraTor's web server via `/query.json`.
  - Take out the metrics-web warning and test the ExoneraTor page.
  - Send release announcement to tor-relays at .
  - Resolve relevant tickets on Trac.

 I'll post a release branch and pre-release tarball shortly.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27697>
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