One of our most common feature requests has been for the ability to alert on the rate of change of a metric over time. We’re excited to finally add this functionality to our suite of alerting options. Now, instead of choosing a threshold for a certain metric (e.g. “notify me when it crosses 20”), you can now specify a percentage change instead (e.g. “notify me when it changes by more than 30% compared to it’s previous values”). This new alert condition type is especially useful for “stable” metrics that are expected to remain within a certain range and not change too abruptly for extended periods of time, such as latency, QPS and error ratios.
Create a new alert policy today to try it out!
For more detail, check out Amir’s blog post at http://googlecloudplatform.blogspot.com/2015/10/alerting-on-a-metrics-rate-of-change.html