If it's urgent to redeploy indexers, here is what i foresee in the
current state of affairs,

- After review and acceptance, merge the diffs:

  - D605, D615: swh-scheduler: bump version (git tag) and upload/deploy
    new version (debian package)

  - D606, D608, D609: swh-indexer: it might be necessary to require the
    new swh-scheduler version in requirements-swh.txt

  - D612: swh-indexer: rebase that patch on the previous merged diffs
    and push, bump version (git tag) and upload/deploy new version
    (debian package)

  - D614: swh-site, production changes, merge, push and deploy on puppet
    master (ask @olasd or @ftigeot)

  - check on dev box that everything goes smoothly already
    (swh-indexer/docs/dev-info.rst)

  - softwareheritage-indexer (somerset): run migration script
    sql/upgrade/128.sql (~> @olasd)

  - softwareheritage-scheduler (prado): create new task_type
    (indexer_mimetype, orchestrator, orchestrator_text). D615 should
    demo the data.

For deploying, those nodes needs changes:

- saatchi (scheduler): need to upgrade the new python3-swh.indexer
  dependency (IIRC puppet does not install the new python3-swh.indexer
  version)

- uffizi (indexer-storage): need to upgrade the new
  python3-swh.indexer.storage dependency (puppet does it)

- indexer-workers (indexer workers): need to upgrade the new
  python3-swh.indexer and restart services (puppet does it)

That means, from louvre (hypervisor with clustershell configured):

ardumont@louvre sudo clush -b -w @windexer-workers -w saatchi -w uffizi "apt-get update; puppet agent --test; dpkg -l python3-swh.indexer"

(~ as per previous note, it's possible saatchi needs to be updated
manually regarding python3-swh.indexer)

I then stop all services from azure nodes

ardumont@louvre sudo clush -b -w @windexer-workers "systemctl stop
swh-worker@swh_indexer_mimetype";

Start only on 1 node, send some data for indexation and check that
everything goes well (or not). If failure, report (kibana helps), fix,
deploy...

When all is good, restart all services stop. And send data for
indexation.