What is the best path to send data (metrics) from Telegraf into SigNoz?

I can see there is an opentelemetry output plugin for telegraf: https://github.com/influxdata/telegraf/tree/master/plugins/outputs/opentelemetry Maybe you can try that?

Great. I was looking on https://docs.influxdata.com/telegraf/v1.19/plugins/ but there is no OpenTelemetry output plugin mentioned.

They added otel plugin support in later versions

Are there some build in dashboards that I can upload into SigNoz to have some visualisation, or do I need build all from scratch? (for Telegraf)

I am not sure we have such a build. Adding @Srikanth Chekuri, he might know

No, we don’t have any built-in dashboards for telegraf.

Do you plan to have some dashboards repo? I see there is already one on github but it's empty.

Yes