Created by Jeroen T. Vermeulen and last modified
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Jeroen T. Vermeulen

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618. By Jeroen T. Vermeulen

Extracted from other branch: Makefile fixes.

617. By Martin Packman

Fix os-scheduler-hints constraint to pass correct json layout [r=hazmat,jameinel]

616. By Kapil Thangavelu

Fix broken maas-tags constraint.

The maas tags wasn't properly converting values for comparision
and was not previously testing tag constraint comparisons.

615. By Kapil Thangavelu

Unit process multiple relations in defined order.

Previously when unit agents were being notified of multiple relations, typicaly
at startup, they would process them in essentially random order. This would
complicate things for applications that would have peer relations as well, for
ha or replication, as they couldn't tell if they were being run standalone or
in a cluster/quorum. Instead when a unit has multiple relations, we process
peer relations first followed by client/server relations.


614. By Kapil Thangavelu

Increase zk session and ping times.

During scale testing work, one of the take aways was the default zookeeper
session time was too low, which caused issues for any transient communication
problems between the agents the zk. The managed client work landed subsequently
does recovery for this and for session expiration, but its better to avoid
the issue entirely by increasing the session time and increasing the heartbeat
time periodicity.


613. By Kapil Thangavelu

Drop orchestra provider support

The orchestra provider is dead upstream, and represents
a significant support burden on the code base. Given
hardware deployments are directed towards MaaS and no
current users, its better to drop this now.


612. By Kapil Thangavelu

Fix relation-ids cache coherency for hooks.

Relation-ids was answering questions about relations
directly from state, whilst other pieces of relation-*
cli was using a hook execution cache. This led to
odd races where a hook would query relation-ids
and then attempt to use relation-list/etc against
that relation resulting in a relation not found error.

This branch also does a drive by to improve the error
reporting for relation not found to include the relation
id where applicable.


611. By Kapil Thangavelu

[trivial] serialized execution test propogation

610. By Kapil Thangavelu

Serialized unit execution on a machine/container

To prevent races for system resources like apt between different
units running on the same machine/container a shared file lock is
taken out for hook execution. Mechanism is resistant to dead
processes holding lock, however per previous juju behavior no
timeout is provided for maximum hook execution time.


609. By Kapil Thangavelu

Disable charm store stats when testing.

When JUJU_TESTING is set to a non empty string value.

- Disable charm stats when getting charm-info or downloading charms.

When JUJU_TESTING is set to 'fast'

- For test instance startup speed, diable apt update/upgrade, also
  propogates to provisioning agent.

R=gary.poster, teknico

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