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

example.

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)