Create and manage New Relic Synthetics scripted browser monitors via NerdGraph

Steps

1. Use the syntheticsCreateScriptBrowserMonitor NerdGraph mutation to create a scripted browser monitor; supply the accountId, name, period (e.g., EVERY_10_MINUTES), status (ENABLED), locations (publicLocations list), and script fields.
2. Write the monitor script in Selenium WebDriver-compatible JavaScript (New Relic Synthetics uses a managed Selenium environment); use $browser and $driver globals to navigate, interact, and assert on page elements.
3. Encode the script as a plain string in the mutation's script.scriptText field; avoid hardcoding credentials — use $secure variables (defined separately in the New Relic UI or via syntheticsSecureCredential mutations) and reference them as $secure.MY_VAR in the script.
4. Set runtimeType to 'CHROME_BROWSER' and runtimeTypeVersion to the desired Chrome major version to opt into the newer runtime; omit these fields to use the legacy runtime, which has a different Node.js and Selenium version.
5. Query monitor status and recent results using the syntheticsMonitor field on the actor query, filtering by monitorId; retrieve lastCheck status, duration, and error details for alerting or reporting pipelines.
6. Create a New Relic alert condition using the NRQL condition mutation, querying the SyntheticCheck event filtered by monitorId and result = 'FAILED' for count-based alerting on synthetic failures.