This is a follow up to I7e5c1e20c7b66b64cbd333f669ef8d8da60daaa8.

Change-Id: I11a86f59c1fb9cddde3370b544ee7bf4e8ae4fb4

Grafana requires the scrape interval to be set to be able to compute
$__rate_interval. The default is 15s which does not match the kolla
default of 60s. The symptom of not setting this is that you will see
"no data" when zooming graphs that use rate queries. This occurs as the
interval will be set to a period shorter than the scrape interval.
The recommendation is that you use a common scrape interval for all
jobs. See:

- https://grafana.com/blog/2020/09/28/new-in-grafana-7.2-__rate_interval-for-prometheus-rate-queries-that-just-work/
- https://stackoverflow.com/questions/66369969/set-scrape-interval-in-provisioned-prometheus-data-source-in-grafana

Change-Id: I7e5c1e20c7b66b64cbd333f669ef8d8da60daaa8

The goal for this push request is to normalize the construction and use
 of internal, external, and admin URLs. While extending Kolla-ansible
 to enable a more flexible method to manage external URLs, we noticed
 that the same URL was constructed multiple times in different parts
 of the code. This can make it difficult for people that want to work
 with these URLs and create inconsistencies in a large code base with
 time. Therefore, we are proposing here the use of
 "single Kolla-ansible variable" per endpoint URL, which facilitates
 for people that are interested in overriding/extending these URLs.

As an example, we extended Kolla-ansible to facilitate the "override"
of public (external) URLs with the following standard
"<component/serviceName>.<companyBaseUrl>".
Therefore, the "NAT/redirect" in the SSL termination system (HAproxy,
HTTPD or some other) is done via the service name, and not by the port.
This allows operators to easily and automatically create more friendly
 URL names. To develop this feature, we first applied this patch that
 we are sending now to the community. We did that to reduce the surface
  of changes in Kolla-ansible.

Another example is the integration of Kolla-ansible and Consul, which
we also implemented internally, and also requires URLs changes.
Therefore, this PR is essential to reduce code duplicity, and to
facility users/developers to work/customize the services URLs.

Change-Id: I73d483e01476e779a5155b2e18dd5ea25f514e93
Signed-off-by: Rafael Weingärtner <rafael@apache.org>

Service REST API urls should be constructed using the
{{ internal_protocol }} and {{ external_protocol }} configuration
parameters.

Change-Id: Id1e8098cf59f66aa35b371149fdb4b517fa4c908
Closes-Bug: 1862817

Service configuration urls should be constructed using
kolla_internal_fqdn instead of kolla_internal_vip_address. Otherwise SSL
validation will fail when certificates are issued using domain names.

Change-Id: I21689e22870c2f6206e37c60a3c33e19140f77ff
Closes-Bug: 1862419

Introduce kolla_address filter.
Introduce put_address_in_context filter.

Add AF config to vars.

Address contexts:
- raw (default): <ADDR>
- memcache: inet6:[<ADDR>]
- url: [<ADDR>]

Other changes:

globals.yml - mention just IP in comment

prechecks/port_checks (api_intf) - kolla_address handles validation

3x interface conditional (swift configs: replication/storage)

2x interface variable definition with hostname
(haproxy listens; api intf)

1x interface variable definition with hostname with bifrost exclusion
(baremetal pre-install /etc/hosts; api intf)

neutron's ml2 'overlay_ip_version' set to 6 for IPv6 on tunnel network

basic multinode source CI job for IPv6

prechecks for rabbitmq and qdrouterd use proper NSS database now

MariaDB Galera Cluster WSREP SST mariabackup workaround
(socat and IPv6)

Ceph naming workaround in CI
TODO: probably needs documenting

RabbitMQ IPv6-only proto_dist

Ceph ms switch to IPv6 mode

Remove neutron-server ml2_type_vxlan/vxlan_group setting
as it is not used (let's avoid any confusion)
and could break setups without proper multicast routing
if it started working (also IPv4-only)

haproxy upgrade checks for slaves based on ipv6 addresses

TODO:

ovs-dpdk grabs ipv4 network address (w/ prefix len / submask)
not supported, invalid by default because neutron_external has no address
No idea whether ovs-dpdk works at all atm.

ml2 for xenapi
Xen is not supported too well.
This would require working with XenAPI facts.

rp_filter setting
This would require meddling with ip6tables (there is no sysctl param).
By default nothing is dropped.
Unlikely we really need it.

ironic dnsmasq is configured IPv4-only
dnsmasq needs DHCPv6 options and testing in vivo.

KNOWN ISSUES (beyond us):

One cannot use IPv6 address to reference the image for docker like we
currently do, see: https://github.com/moby/moby/issues/39033
(docker_registry; docker API 400 - invalid reference format)
workaround: use hostname/FQDN

RabbitMQ may fail to bind to IPv6 if hostname resolves also to IPv4.
This is due to old RabbitMQ versions available in images.
IPv4 is preferred by default and may fail in the IPv6-only scenario.
This should be no problem in real life as IPv6-only is indeed IPv6-only.
Also, when new RabbitMQ (3.7.16/3.8+) makes it into images, this will
no longer be relevant as we supply all the necessary config.
See: https://github.com/rabbitmq/rabbitmq-server/pull/1982

For reliable runs, at least Ansible 2.8 is required (2.8.5 confirmed
to work well). Older Ansible versions are known to miss IPv6 addresses
in interface facts. This may affect redeploys, reconfigures and
upgrades which run after VIP address is assigned.
See: https://github.com/ansible/ansible/issues/63227

Bifrost Train does not support IPv6 deployments.
See: https://storyboard.openstack.org/#!/story/2006689



Change-Id: Ia34e6916ea4f99e9522cd2ddde03a0a4776f7e2c
Implements: blueprint ipv6-control-plane
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

Assuming both Prometheus and Grafana are enabled, this change
configures Grafana such that it can use data collected by the
Prometheus server.

Partially-Implements: blueprint prometheus
Change-Id: I0290806d0c622b1de33cf7047f099795b4c780b9