[otel] - otelhttp.WithRouteTag() has been removed from opentelemetry-go-contrib

[seapike]

Any code generated deom a DSL with the _ "goa.design/plugins/v3/otel" import will not run, as otelhttp.WithRouteTag() has been removed from the openetelemetry-go-contrib repository in v0.65.0

plugins/otel/generate.go

Line 25 in d9fdc6e

`mux.Handle("{{ .Verb }}", "{{ .Path }}", otelhttp.WithRouteTag("{{ .Path }}", f).ServeHTTP)`,

[seapike]

Though the reason for deprecation means that this plugin is redundant, the route is automatically added anyhow.

[disintegrator]

Though the reason for deprecation means that this plugin is redundant, the route is automatically added anyhow.

From my tests, this doesn't seem to be happening in Goa / Chi. I expect to see an http.route attribute but that's no longer the case if I remove the Goa OTel plugin.

[raphael]

Fixed in two PRs:

1. http: set r.Pattern on dispatched requests for automatic route tagging goa#3897 — The Goa HTTP muxer now sets r.Pattern on every dispatched request (using the Go 1.22+ "METHOD /path" convention). This lets otelhttp v0.65.0+ automatically tag spans and metrics with the matched route.

2. Deprecate otel plugin: route tagging is now built into the Goa muxer #242 — The otel plugin is deprecated and is now a no-op. Remove the blank import from your design package and regenerate:

   - import _ "goa.design/plugins/v3/otel"

No other changes needed — route tagging happens automatically in the muxer.