Merge ~peppepetra/charm-prometheus-openstack-exporter:add_dash_to_readme into charm-prometheus-openstack-exporter:master

[Giuseppe Petralia]

Add dashboards usage to readme.

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

This merge proposal is being monitored by mergebot. Change the status to Approved to merge.

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PASSED: Continuous integration, rev:7aef334c1121e43da1436cd57aefe30258551b96
https://jenkins.canonical.com/bootstack/job/lp-charm-prometheus-openstack-exporter-ci/8/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/bootstack/job/lp-charm-test-unit/206/
    None: https://jenkins.canonical.com/bootstack/job/lp-update-mp/606/

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review: Approve (continuous-integration)

[Zachary Zehring (zzehring)]

Couple small comments in line.

review: Needs Fixing

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[Zachary Zehring (zzehring)]

LGTM +1

review: Approve

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PASSED: Continuous integration, rev:5006906a83554d52aea0ae7f21582e1115d54294
https://jenkins.canonical.com/bootstack/job/lp-charm-prometheus-openstack-exporter-ci/9/
Executed test runs:
    SUCCESS: https://jenkins.canonical.com/bootstack/job/lp-charm-test-unit/207/
    None: https://jenkins.canonical.com/bootstack/job/lp-update-mp/607/

Click here to trigger a rebuild:
https://jenkins.canonical.com/bootstack/job/lp-charm-prometheus-openstack-exporter-ci/9//rebuild

review: Approve (continuous-integration)

[🤖 Canonical IS Merge Bot (canonical-is-mergebot)]

Change successfully merged at revision 4b3d8495942f3ed9eaf99c5a65b8ccb9869e350f

diff --git a/src/README.md b/src/README.md
index cc354ea..681edc0 100644
--- a/src/README.md
+++ b/src/README.md
@@ -41,6 +41,13 @@ dict (see setting description hints)
     juju add-relation prometheus-openstack-exporter swift-storage-z2
     juju add-relation prometheus-openstack-exporter swift-storage-z3
     juju add-relation prometheus prometheus-openstack-exporter
+    
+This charm provides two Grafana dashboards: *OpenStack Overview* and 
+*Hypervisor Overview*. The two dashboards require at least Grafana v7.4.1 (current snap 
+7/stable). The two dashboards can be loaded by relating the charm to the Grafana one 
+with:
+
+    juju add-relation prometheus-openstack-exporter:dashboards grafana:dashboards
 
 # Configuration Options