Image Rendering: New setting to control render request concurrency (#23950)

Fixes #23806

Co-Authored-By: Torkel Ödegaard <torkel@grafana.com>
Co-Authored-By: Arve Knudsen <arve.knudsen@gmail.com>

pkg/api/render.go

@@ -52,7 +52,6 @@ func (hs *HTTPServer) RenderToPng(c *models.ReqContext) {
 		headers["Accept-Language"] = acceptLanguageHeader
 	}
 
-	maxConcurrentLimitForApiCalls := 30
 	result, err := hs.RenderService.Render(c.Req.Context(), rendering.Opts{
 		Width:             width,
 		Height:            height,
@@ -63,7 +62,7 @@ func (hs *HTTPServer) RenderToPng(c *models.ReqContext) {
 		Path:              c.Params("*") + queryParams,
 		Timezone:          queryReader.Get("tz", ""),
 		Encoding:          queryReader.Get("encoding", ""),
-		ConcurrentLimit:   maxConcurrentLimitForApiCalls,
+		ConcurrentLimit:   hs.Cfg.RendererConcurrentRequestLimit,
 		DeviceScaleFactor: scale,
 		Headers:           headers,
 	})