Let me now take a look at the red alert from within the Service Limits category. To do so, select the alert from the main dashboard page:
The service check limit seen here is for VPC. As explained previously, the service limit checks for usage that is more than 80% of the service limit; in this case, it's the VPC limit.
The alert criteria are either yellow (80% of the limit is reached), red (100% of the limit is reached), or blue (Trusted Advisor was unable to retrieve utilization or limits in one or more regions).
Based on this alert criteria, I can assume that I have five VPCs within a single region, and the recommended action to resolve this is to open a case in the Support Center to request a limit increase if I anticipate that I will require more than five VPCs in the affected region.
Looking at my list of VPCs, I can see that it is the eu-west-1 region that does indeed have five VPCs within it:
As we have seen, AWS Trusted Advisor is a great tool for...