feat: standardize OpenTelemetry HTTP span names to include method and route pattern

pkg/srv/http/http.go

@@ -10,6 +10,7 @@ import (
 	"net"
 	"net/http"
 	"os"
+	"regexp"
 	"strings"
 	"time"
 
@@ -27,6 +28,7 @@ import (
 var (
 	httpMeter                   metric.Meter
 	httpTracer                  trace.Tracer
+	httpPatternWithMethodRegexp = regexp.MustCompile(`(\w+) .*`)
 	defReadTimeout              = 10 * time.Second
 	defWriteTimeout             = 10 * time.Second
 	defIdleTimeout              = 15 * time.Second
@@ -84,12 +86,16 @@ func prepHTTPServer(opts *opts.AppHTTP) *http.Server {
 			}
 		}),
 		otelhttp.WithSpanNameFormatter(func(operation string, r *http.Request) string {
-			_, pattern := mux.Handler(r)
-			if pattern != "" {
-				return pattern // Use the route pattern as the span name, e.g., "/users/{id}"
+			endpoint := r.URL.Path
+			if _, pattern := mux.Handler(r); pattern != "" {
+				endpoint = pattern
 			}
-			// Fallback to the default naming convention if no route is found.
-			return operation + " " + r.URL.Path
+
+			if httpPatternWithMethodRegexp.MatchString(endpoint) {
+				return endpoint
+			}
+
+			return fmt.Sprintf("%s %s", r.Method, endpoint)
 		}))
 
 	// Set timeouts from defaults, override