16 lines
692 B
Markdown
16 lines
692 B
Markdown
+++
|
|
title = 'Improving InfluxDB Sensor Data Queries'
|
|
date = 2018-08-07T18:28:00-06:00
|
|
+++
|
|
|
|
I now understand why Grafana built the initial query with `GROUP BY
|
|
time($__interval)`. With a hard-coded value in `time()`, every single point is
|
|
displayed on the graph, regardless of the zoom level. The `$__interval`
|
|
variable scales this value based on the time period displayed.
|
|
|
|
Initially, this did not work for me, and Grafana just drew seemingly random
|
|
points when using any view besides "last 6 hours." This turned out to be
|
|
because the default value for "min time interval" was not set (or was
|
|
incorrect). Seting it to "10s" (which is the collectd poll interval) corrected
|
|
this issue as well.
|