This commit adds support for Grafana's new alerting system, Grafana
Alerting. The existing Grafana integration has been modified to
detect the version of the notification through the structure of the
payload body, since the the structure varies by version. Support for
legacy alerting is been continued. Example fixtures have been added
for Grafana Alerting's webhooks.
Tests updated.
Since FIXTURE_DIR_NAME is the name of the folder that contains the view
and tests modules of the webhook and another folder called "fixtures" that
store the fixtures, it is more appropriate to call it WEBHOOK_DIR_NAME,
especially when we want to refer to the view module using this variable.
Having the alert state in the message body is useful when alert topics
are not defined by alert description but encoded in the url.
E.g. in large environments having a topic for each alert [alerting] and [ok] would
make it harder to properly track if an alert has been resolved.
When each alert is in a single topic, so far, the alert state has been missing.
This change will add the current alert state and a fitting icon in front
of the alert name.(Similar to the prometheus alertmanager integration)
The test cases have been amended to cover all possible alert states, even
though realistically grafana only fires the ok and alerting states via
webhook.
Almost all webhook tests use this helper, except a few
webhooks that write to private streams.
Being concise is important here, and the name
`self.send_and_test_stream_message` always confused
me, since it sounds you're sending a stream message,
and it leaves out the webhook piece.
We should consider renaming `send_and_test_private_message`
to something like `check_webhook_private`, but I couldn't
decide on a great name, and it's very rarely used. So
for now I just made sure the docstrings of the two
sibling functions reference each other.
Hari Prashant Bhimaraju
PIG208
AdamVB
Anders Kaseorg
Steve Howell
Jenny Ghose