Outro PromQL Quick is not quick enough Brian Brazil optimized PromQL 5x faster for time vector functions 100x reduction in garbage to collect Richard Hartmann & Frederic Branczyk @TwitchiH & @fredbrancz

by (app) 函数 Prometheus 函数非常多，具体文档参考：https://prometheus.io/docs/prometheus/latest/ querying/functions/ 这一节我们举例说明一些常用的函数。 absent_over_time 接收一个 range-vector，如果range-vector是空，则返回1，表示absent，如果range-vector