# `Mob.Diag.Heir`
[🔗](https://github.com/genericjam/mob/blob/master/lib/mob/diag/heir.ex#L1)

Holds diagnostic tables while their owner is down, and starts the next owner.

Every `Mob.Diag.Store` table names this process as its ETS heir, with the
store as heir data, so a store owner that dies hands its tables — rows intact
and still writable, since they are public — here instead of deleting them.
The heir then starts a replacement owner, which takes them back with
`give_back/2`. Nothing else would: `Mob.Diag.Store.ensure/1` only checks
that a store's tables exist, and they do, so without a restart the heir held
them until it died too and took every row with it (MOB-302).

The restart runs in a process of its own. The new owner's setup calls
`give_back/2`, which the heir could not answer while starting it, and a
store that fails to start must not take the heir down. Started on first use
and unlinked, like the owners.

# `child_spec`

Returns a specification to start this module under a supervisor.

See `Supervisor`.

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*Consult [api-reference.md](api-reference.md) for complete listing*