fix: replace nonexistent wait_until param from playwright page API call (open-telemetry#2374)

* fix: remove nonexistent `wait_until` param from playwright page API call

* chore: add playwright `wait_until` fix to change log

* delete trailing space

---------

Co-authored-by: Juliano Costa <julianocosta89@outlook.com>

Author: 2 people

CHANGELOG.md

@@ -76,6 +76,8 @@ the release.
   ([#2352]((https://github.com/open-telemetry/opentelemetry-demo/pull/2352)))
 * [image-provider] Update to latest version of nginx and alpine
   ([#2369](https://github.com/open-telemetry/opentelemetry-demo/pull/2369))
+* [load-generator] Fix Playwright wait until load state error
+  ([#2374](https://github.com/open-telemetry/opentelemetry-demo/pull/2374))
 
 ## 2.0.2
 

src/load-generator/locustfile.py

@@ -248,8 +248,10 @@ async def add_product_to_cart(self, page: PageWithRetry):
                     page.on("console", lambda msg: print(msg.text))
                     await page.route('**/*', add_baggage_header)
                     await page.goto("/", wait_until="domcontentloaded")
-                    await page.click('p:has-text("Roof Binoculars")', wait_until="domcontentloaded")
-                    await page.click('button:has-text("Add To Cart")', wait_until="domcontentloaded")
+                    await page.click('p:has-text("Roof Binoculars")')
+                    await page.wait_for_load_state("domcontentloaded")
+                    await page.click('button:has-text("Add To Cart")')
+                    await page.wait_for_load_state("domcontentloaded")
                     await page.wait_for_timeout(2000)  # giving the browser time to export the traces
                     logging.info("Product added to cart successfully")
                 except Exception as e: