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cd3df73944
Before this change, the default window for the etcdMembersDown network failure rate function was recently changed to 1 minute. While this helps detect a etcd recovery more quickly, it depends on scrape intervals of <= 15s to collect sufficient data points for the rate function. In practice, an interval of >= 30s is more typical, which causes the rate function to be less accurate. This patch increases the window to 2m, which is a compromise between the original value of 3m and the 1m change introuced with 2aa5684, and should accomodate more typical scrape intervals. To offset the window change and to further improve the chance that the alert will only fire when etcd is truly dead, this patch changes the `for` clause from 3m to 10m. The rationale is as follows: 1. There can be significant variance in durations following a reboot before etcd is scraped and detected as available. 2. A conservative trigger like 10m seems less likely to produce a false alarm in the face of such variance. 3. In this alerting situation, if the outage is real, it seems unlikely that an additional 7 minutes of delay before (for example) paging somebody will make a significant impact on the overall response.
The etcd documentation
etcd is a distributed key-value store designed to reliably and quickly preserve and provide access to critical data. It enables reliable distributed coordination through distributed locking, leader elections, and write barriers. An etcd cluster is intended for high availability and permanent data storage and retrieval.
Please note that the files in this directory are source files for the built and rendered documentation that can be viewed at etcd.io/docs.