Andrzej Jackowski c59a7db1c9 service_level_controller: automatically create sl:driver ...

This commit:
  - Increases the number of allowed scheduling groups to allow the
    creation of `sl:driver`.
  - Adds the `DRIVER_SERVICE_LEVEL` feature, which prevents creating
    `sl:driver` until all nodes have increased the number of
    scheduling groups.
  - Starts using `get_create_driver_service_level_mutations`
    to unconditionally create `sl:driver` on
    `raft_initialize_discovery_leader`. The purpose of this code
    path is ensuring existence of `sl:driver` in new system and tests.
  - Starts using `migrate_to_driver_service_level` to create `sl:driver`
    if it is not already present. The creation of `sl:driver` is
    managed by `topology_coordinator`, similar to other system keyspace
    updates, such as the `view_builder` migration. The purpose of this
    code path is handling upgrades.
  - Modifies related tests to pass after `sl:driver` is added.

Later in this patch series, `sl:driver` will be used by
`transport/server` to handle selected traffic, such as the driver's
schema and topology fetches.

Refs: scylladb/scylladb#24411

2025-10-08 08:24:43 +02:00

22 KiB

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