Telemetry
Both JS and CSS files server using CloudFront (AWS managed CDN service). We are using the built-in matrics along with some advanced ones in order to catch errors on the fly.
Key indicators for monitoring:
Requests(Sum)
Data transfer in KB
Error rate
4XX error response
5XX error response
Origin latency.
Cache hit rate
Alerts
the dirstubation has several alerts and can be added more as well:
Alerts are being sent to our pager duty.
Number of errors in one minute bigger than the threshold(100)
5XX error rate per minute (50)
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