status.softwareheritage.org: Define communication policy behind downtime per service

What does it mean to be down for the following services (well so far):

• www.softwareheritage.org
• archive.softwareheritage.org
• forge.softwareheritage.org
• deposit.softwareheritage.org (workers? service api?)

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Migrated from T1917 (view on Phabricator)