fix: Updated incorrect image link for monitoring article

Author: ripixel

thoughts/articles/2019-09-09_The-Importance-of-Monitoring-and-Alerting.md

@@ -43,7 +43,7 @@ Ok, let's assume we did have that monitoring in place - what is the expected num
 
 Great - now let's have a look at the actual:
 
-![alt text](https://dvelp-production.s3.amazonaws.com/uploads/image/file/177/x_large_1568038850-tol_service_final.PNG "Site Actual")
+![alt text](https://dvelp-production.s3.amazonaws.com/uploads/image/file/179/x_large_1568038897-tol_site_actual.PNG "Site Actual")
 
 I think that would do it, yes. Overloading the service with around 50x the expected calls (that's already taking into account the headroom planned).