I found this page , which seems to be the only one about where to find the metrics host+port for signoz cloud. The telegraf otel output plugin has a spot to put headers, so I added

signoz-access-token = "MY-TOKEN"

in there. Running telegraf with that config gives me an error:

2023-12-08T165516Z E! [agent] Error writing to outputs.opentelemetry: rpc error: code = Unavailable desc = connection error: desc = "error reading server preface: http2: frame too large"