How to send caPutLog logs to Grafana Loki

[Afonso Haruo Carnielli Mukai via Tech-talk <tech-talk at aps.anl.gov>]

Hi,

I'm working on a proof of concept for sending IOC PV put logs to a logging server using caPutLog and Grafana Loki. I'm new to Loki, but my understanding is that it only accepts logs via the HTTP API, different from something like Graylog where you can configure inputs in different formats.

Is anyone using caPutLog and Loki? If so, how do you forward the logs to the server? After some discussions with people working with EPICS here, I can think of the following options:

1. Implement client-side code on the IOC to send directly to Loki (seems to be more work than the other options)
2. Implement a simple server that receives the logs from caPutLog and sends it to Loki
3. (Not sure caPutLog supports this) Get the IOC logs to the system journal/container logs (the IOCs in question are containerised) and then use Grafana Alloy to send them to Loki - is it possible to configure caPutLog to just print the logs to the console, without setting a server?

If anyone has experience or thoughts on this, comments and suggestions are appreciated.

Best regards,
Afonso Mukai
Brazilian Synchrotron Light Laboratory

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