石墨：显示与先前值的变化

Question

我将在垃圾收集中花费的时间发送给 Graphite（通过 jmx 从 jvm 获取）。这是一个增加的计数器。他们有办法让 Graphite 每分钟绘制一次变化图表，这样我就可以看到一个图表，显示每分钟在 GC 中花费的时间？

Answer 1

您应该能够使用 Derivative 函数将计数器变为命中率，然后使用 summarise 函数将计数器变为您之后的时间范围。

&target=summarize(derivative(java.gc_time), "1min") # time spent per minute

导数（系列列表）

This is the opposite of the integral function. This is useful for taking a 
running totalmetric and showing how many requests per minute were handled.

&target=derivative(company.server.application01.ifconfig.TXPackets)

每次运行 ifconfig 时，RX 和 TXPacket 都会更高（假设有网络流量。） 通过应用导数函数，您可以了解每分钟发送或接收的数据包，即使您只记录总数。

summarize(seriesList, intervalString, func='sum', alignToFrom=False)

Summarize the data into interval buckets of a certain size.
By default, the contents of each interval bucket are summed together. 
This is useful for counters where each increment represents a discrete event and
retrieving a “per X” value requires summing all the events in that interval.

来源：http://graphite.readthedocs.org/en/0.9.10/functions.html