SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.

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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)

Like <http://Logz.io|Logz.io> have some "Windows Performance - Telegraf" dashboard ready to use.

I am not sure we have such a build.
Adding <@U01NT95GV8B>, 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.