Image Render: Propagate traces in HTTP mode (#100559)

* Rendering: Propagate traces in HTTP mode

* update ini file

* update docs

* update doc

* fix imports

* fix go files

* fix CI

* update ini config

* remove servicename

---------

Co-authored-by: AgnesToulet <35176601+AgnesToulet@users.noreply.github.com>
Co-authored-by: nmarrs <nathanielmarrs@gmail.com>

conf/defaults.ini

@@ -1875,6 +1875,9 @@ rendering_dumpio =
 # This can be useful to enable (true) when optimizing the rendering mode settings to improve the plugin performance or when troubleshooting.
 rendering_timing_metrics =
 
+# This is a configuration for OTLP exporter with HTTP protocol, set this URL to enable tracing (ex: http://localhost:4318/v1/traces). Default to empty (tracing disabled).
+rendering_tracing_url =
+
 # Additional arguments to pass to the headless browser instance. Default is --no-sandbox. The list of Chromium flags can be found
 # here (https://peter.sh/experiments/chromium-command-line-switches/). Multiple arguments is separated with comma-character.
 rendering_args =

conf/sample.ini

@@ -1809,6 +1809,9 @@ timeout = 30s
 # This can be useful to enable (true) when optimizing the rendering mode settings to improve the plugin performance or when troubleshooting.
 ;rendering_timing_metrics =
 
+# This is a configuration for OTLP exporter with HTTP protocol, set this URL to enable tracing (ex: http://localhost:4318/v1/traces). Default to empty (tracing disabled).
+;rendering_tracing_url =
+
 # Additional arguments to pass to the headless browser instance. Default is --no-sandbox. The list of Chromium flags can be found
 # here (https://peter.sh/experiments/chromium-command-line-switches/). Multiple arguments is separated with comma-character.
 ;rendering_args =

docs/sources/setup-grafana/image-rendering/_index.md

@@ -580,3 +580,21 @@ RENDERING_VIEWPORT_PAGE_ZOOM_LEVEL=1
   }
 }
 ```
+
+#### Tracing
+
+Enable OpenTelemetry Tracing by setting the tracing URL. Default is empty (disabled).
+
+```bash
+RENDERING_TRACING_URL="http://localhost:4318/v1/traces"
+```
+
+```json
+{
+  "rendering": {
+    "tracing": {
+      "url": "http://localhost:4318/v1/traces"
+    }
+  }
+}
+```

go.mod

@@ -519,7 +519,7 @@ require (
 	go.opencensus.io v0.24.0 // @grafana/grafana-backend-group
 	go.opentelemetry.io/auto/sdk v1.1.0 // indirect
 	go.opentelemetry.io/contrib/detectors/gcp v1.33.0 // indirect
-	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.59.0 // indirect
+	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.59.0 // @grafana/sharing-squad
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.34.0 // indirect
 	go.opentelemetry.io/otel/metric v1.34.0 // indirect
 	go.opentelemetry.io/otel/sdk/metric v1.32.0 // indirect

pkg/services/rendering/http_mode.go

@@ -14,6 +14,8 @@ import (
 	"os"
 	"strconv"
 	"time"
+
+	"go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp"
 )
 
 var netTransport = &http.Transport{
@@ -25,7 +27,7 @@ var netTransport = &http.Transport{
 }
 
 var netClient = &http.Client{
-	Transport: netTransport,
+	Transport: otelhttp.NewTransport(netTransport),
 }
 
 const authTokenHeader = "X-Auth-Token" //#nosec G101 -- This is a false positive