Emit two spans (server and client)

dkrizic commented 9 months ago

Is your feature request related to a problem? Please describe

This module should emit two spans:

A server span (the part that receives the external request)
A client span which is nested in the server span

This is according to the specification of Open Telemetry. I have this scenaria

Frontend (emits client span)
Nginx with Otel module as proxy (emits server span, should emit both as described)
Backend (emits server span)

The problem now is, that components like Tempo Metrics Generator does not connect the Nginx with the actual backend, because it expects a client->server connection.

Describe the solution you'd like

Emit two spans as describe before

Describe alternatives you've considered

No other alternatives.

p-pautov commented 8 months ago

Duplicate of #17. The request makes sense in general, though telemetry processing tools could also handle such situation better...

dkrizic commented 8 months ago

All observability solutions I use have that problem:

Grafana/Tempo
Azure Application Insights
DataDog

Simply because Nginx does not implement the OpenTelemetry spec.

nginxinc / nginx-otel