2.0 metrics breaks 1.25

[Chris MacNaughton]

Trying to deploy a charm that defines the metrics.yaml file for metrics in 2.0+ fails due to "ERROR no metric registration url is specified"[1]

[1]: https://review.openstack.org/#/c/392585/

[Casey Marshall (cmars)]

Need to first land https://github.com/juju/charm/pull/225, then update dependencies.tsv in https://github.com/juju/juju/pull/6549 accordingly.

[Casey Marshall (cmars)]

@Icey
I'm able to deploy your ceph-mon charm at 8c1ef1d on 1.25 with my above patch.

However, you'll get a hook error in collect-metrics. This patch to your charm should fix it:

ubuntu@juju-125-dev:~/trusty/charm-ceph-mon$ git diff
diff --git a/hooks/ceph_hooks.py b/hooks/ceph_hooks.py
index 59b1c9c..8f49ccc 100755
--- a/hooks/ceph_hooks.py
+++ b/hooks/ceph_hooks.py
@@ -140,7 +140,7 @@ def collect_metrics():
             cluster = rados.Rados(conffile='/etc/ceph/ceph.conf')
             cluster.connect(timeout=60) # 1 minute timeout
             log("Gathering pool stats")
- version = rados.version()
+ version = cluster.version()
             pools = cluster.list_pools()
             kb_used = 0
             for pool in pools:

[Chris MacNaughton (chris.macnaughton)]

@cmars thanks for this. Is there an eta on your patch landing in a released version?

[Curtis Hovey (sinzui)]

As this issue is fixed in a supported old version, the clients can be found in the 1.25-proposed PPA
     https://launchpad.net/~juju/+archive/ubuntu/1.25-proposed
The successful candidate will graduate to the
     https://launchpad.net/~juju/+archive/ubuntu/1.25
PPA