* (WIP) send alerts to external, internal, or both alertmanagers
* Modify admin configuration endpoint, update swagger docs
* Integration test for admin config updated
* Code review changes
* Fix alertmanagers choice not changing bug, add unit test
* Add AlertmanagersChoice as enum in swagger, code review changes
* Fix API and tests errors
* Change enum from int to string, use 'SendAlertsTo' instead of 'AlertmanagerChoice' where necessary
* Fix tests to reflect last changes
* Keep senders running when alerts are handled just internally
* Check if any external AM has been discovered before sending alerts, update tests
* remove duplicate data from logs
* update comment
* represent alertmanagers choice as an int instead of a string
* default alertmanagers choice to all alertmanagers, test cases
* update definitions and generate spec
* Alerting: Expose discovered and dropped Alertmanagers
Exposes the API for discovered and dropped Alertmanagers.
* make admin config poll interval configurable
* update after rebase
* wordsmith
* More wordsmithing
* change name of the config
* settings package too
* Alerting: Send alerts to external Alertmanager(s)
Within this PR we're adding support for registering or unregistering
sending to a set of external alertmanagers. A few of the things that are
going are:
- Introduce a new table to hold "admin" (either org or global)
configuration we can change at runtime.
- A new periodic check that polls for this configuration and adjusts the
"senders" accordingly.
- Introduces a new concept of "senders" that are responsible for
shipping the alerts to the external Alertmanager(s). In a nutshell,
this is the Prometheus notifier (the one in charge of sending the alert)
mapped to a multi-tenant map.
There are a few code movements here and there but those are minor, I
tried to keep things intact as much as possible so that we could have an
easier diff.
