Replaces the instance label on prometheus metrics with the inventory
hostname as opposed to the ip address. The ip address is still used as
the target address which means that there is no issue of the hostname
being unresolvable. Can be optionally enabled or set to FQDNs by
changing the prometheus_instance_label variable as mentioned in the
release notes.

Co-Authored-By: Will Szumski <will@stackhpc.com>
Change-Id: I387c9d8f5c01baf6054381834ecf4e554d0fff35

This is a follow up to I7e5c1e20c7b66b64cbd333f669ef8d8da60daaa8.

Change-Id: I11a86f59c1fb9cddde3370b544ee7bf4e8ae4fb4

The ipmi-exporter code blocks had too much indentation.

Change-Id: I2cf3ab4873d9df2dfe1375cf7e2e0e5dc6571120

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

Change-Id: I0d7c7f47e6653cf2903589a9c86798a8c6404af5

Deprecates support for Prometheus v1.x.
In Xena support for it will be removed from Kolla Ansible.

Change-Id: I027b19621196c698e09f79af294ba1b5dbfc0516

Update for the example command line options.

Change-Id: Ida6e882d1014cdc5e55383a5d5ba8fa0e824a693

It is now possible to deploy either 1.x or 2.x version of Prometheus.
The new 2.x version introduces breaking changes in terms of storage
format and command line options.

Change-Id: I80cc6f1947f3740ef04b29839bfa655b14fae146
Co-Authored-By: Radosław Piliszek <radoslaw.piliszek@gmail.com>

This provides a generic mechanism to include extra files
that you can reference in prometheus.yml, for example:

scrape_targets:
  - job_name: ipmi
    params:
      module: default
    scrape_interval: 1m
    scrape_timeout: 30s
    metrics_path: /ipmi
    scheme: http
    file_sd_configs:
    - files:
      - /etc/prometheus/extras/file_sd/ipmi-exporter-targets.yml
      refresh_interval: 5m

Change-Id: Ie2f085204b71725b901a179ee51541f1f383c6fa
Related: blueprint custom-prometheus-targets

This provides a mechanism to scrape targets defined outside of kolla-ansible.

Depends-On: https://review.opendev.org/#/c/685671/
Change-Id: I0950341b147bb374b4128f09f807ef5a756f5dfa
Related: blueprint custom-prometheus-targets

Change-Id: I8bb39eaf8a4239c37fcbf91b55ec8003542e2506