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The 503 Errors report contains a bar graph that allows you to view the top 10 requests that resulted in a 503 Service Unavailable response code. A 503 Service Unavailable response code occurs when the origin server is unable to provide a response. In the case of our CDN, a 503 Service Unavailable response code typically occurs when a web server associated with a customer originRefers to a CDN configuration that identifies one or more web servers that will serve as the source from which content may be delivered via the CDN. configuration is unavailable either due to maintenance or because it is overloaded.
For each asset in the bar graph, you can get a quick sense of how many requests resulted in a 503 Service Unavailable response code by comparing the color-coded portions of the bar corresponding to it. The yellow portion of the bar indicates all of the requests that returned a 503 Service Unavailable response code for that asset. The remaining red portion represents the requests that returned a different response code for that asset.
The data that was used to generate the graph is displayed directly below it.