The remote write path differs based on whether the data source is actually
Prometheus, Mimir, Cortex, or an older version of Cortex. We do not want
users to have to specify the path, so this change determines the path as
best it can.
It may be in the future we have to make this configurable per-datasource
to cater for setups where it's impossible to determine the correct path.
The change to use WriteDatasource was done in a previous commit, this adds a
test case using DatasourceWriter, in addition to the one using PrometheusWriter.
* Add success case and tests for writer using metrics
* Use testable version of clock
* Assert a specific series was written
* Fix linter
* Fix manually constructed writer
* Create some integration testing infra for RRs
* whoops
* Require no error in responding
* fix linter
* Panic, no need to pass testing around
* Extend status test
Alexander Akhmetov
Steve Simpson
Alexander Weaver