How to apply jitter param in NABox

[rahulguptajss]

As mentioned in #2769, enabling jitter may help reduce partial aggregation while querying performance counter from ONTAP.

What is jitter?
By default, Harvest sends all performance object queries at almost the same or nearby times. To smear the collector startup times across a wider window, you can use jitter with a given time, let's say one minute, then all performance object queries are distributed across that minute randomly.

⚠️ Note:
Below steps are applicable for NABox and ZapiPerf Collector.

Step 1: Create custom_jitter.yaml

Navigate to the zapiperf directory:

cd /opt/harvest2-conf/conf/zapiperf

Create custom_jitter.yaml:

vi custom_jitter.yaml

Update the file with the following content:

jitter: 1m

Step 2: Restart NABox containers

dc restart