promtail client is not able to send orgID headers

[tivvit]

I am writing a Kafka to Loki component and I am using Loki client from promtail. I am not using proxy for authentication yet but I think that it will not solve my problem.

Problem is that the data in Kafka is multi-tenant, therefore I need to send data to Loki with X-Scope-OrgID header. Determining OrgID is not trivial, therefore I think it would not be great to solve it in the proxy. It would be possible to send it in the data field but then it would have to be parsed in the proxy to determine OrgID but I think it is just simpler to set the header directly in the client.

The client is creating batches based on the labels, therefore I propose extracting the header from the labels.

I will send PR with example code.

[tivvit]

I can see that all logs (entries and labels) are sent in one bulk. How does promtail solves this? When proxy gets this request I suppose everything has to be from one organization.

I will try to split send to multiple sends with different headers.

[stale]

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