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[Allison Randal <allison@xxxxxxxxxxx>]

Public bug reported:

The gate was substantially delayed today by a handful of alembic db
migration changes that hit the gate at the same time, and failed with
the following error in logs/devstacklog.txt:

Only a single head is supported. The script directory has multiple heads
(due to branching), which must be resolved by manually editing the
revision files to form a linear sequence. Run `alembic branches` to see
the divergence(s).

The current blockage was cleared by sequencing the db migrations to
resolve alembic's branching conflict. This bug is linked to an elastic-
recheck fingerprint, to track any future recurrence of the problem.

** Affects: neutron
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1288427

Title:
  Unsequenced alembic migration files block the gate.

Status in OpenStack Neutron (virtual network service):
  New

Bug description:
  The gate was substantially delayed today by a handful of alembic db
  migration changes that hit the gate at the same time, and failed with
  the following error in logs/devstacklog.txt:

  Only a single head is supported. The script directory has multiple
  heads (due to branching), which must be resolved by manually editing
  the revision files to form a linear sequence. Run `alembic branches`
  to see the divergence(s).

  The current blockage was cleared by sequencing the db migrations to
  resolve alembic's branching conflict. This bug is linked to an
  elastic-recheck fingerprint, to track any future recurrence of the
  problem.

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