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These tests have been loitering on a branch of mine for a while: they already provide value even without all the secondary mode bits landed yet, and the Workload helper is handy for other tests too. - `Workload` is a re-usable test workload that replaces some of the arbitrary "write a few rows" SQL that I've found my self repeating, and adds a systematic way to append data and check that reads properly reflect the changes. This append+validate stuff is important when doing migrations, as we want to detect situations where we might be reading from a pageserver that has not properly seen latest changes. - test_multi_attach is a validation of how the pageserver handles attaching the same tenant to multiple pageservers, from a safety point of view. This is intentionally separate from the larger testing of migration, to provide an isolated environment for multi-attachment. - test_location_conf_churn is a pseudo-random walk through the various states that TenantSlot can be put into, with validation that attached tenants remain externally readable when they should, and as a side effect validating that the compute endpoint's online configuration changes work as expected. - test_live_migration is the reference implementation of how to drive a pair of pageservers through a zero-downtime migration of a tenant. --------- Co-authored-by: Arpad Müller <arpad-m@users.noreply.github.com>