Treat all 2xx response code as valid when using the webhook receiver

[floriannadaud]

Description

I'm sending events to loki with a webhook configuration.
Events are pushed and accepted with a 204 response code from loki

However, because the status code is not 200, logs are showing this error:

2020-06-19T13:27:31Z DBG app/pkg/exporter/channel_registry.go:59 > Cannot send event error="not 200: " event="Started container xxxxxxxxxxxxxxxxx" sink=loki

kubernetes-event-exporter only consider http.StatusOK as a correct response code from this bit of code

Proposed solution

Treat all 2xx response code as valid

[mustafaakin]

Yes, just merged a code to treat 201 as well, but it might be better just to allow all 2xx

[bygui86]

@floriannadaud can you share the configuration you used to send events to loki?

thanks a lot in advance for your help!!