Adding upstream version 1.37.1.upstream/1.37.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+<!--
+title: "idlejitter.plugin"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/collectors/idlejitter.plugin/README.md
+-->
+
+# idlejitter.plugin
+
+Idle jitter is a measure of delays in timing for user processes caused by scheduling limitations.
+
+## How Netdata measures idle jitter
+
+A thread is spawned that requests to sleep for 20000 microseconds (20ms).
+When the system wakes it up, it measures how many microseconds have passed.
+The difference between the requested and the actual duration of the sleep, is the idle jitter.
+This is done at most 50 times per second, to ensure we have a good average. 
+
+This number is useful:
+
+- In multimedia-streaming environments such as VoIP gateways, where the CPU jitter can affect the quality of the service.
+- On time servers and other systems that require very precise timing, where CPU jitter can actively interfere with timing precision.
+- On gaming systems, where CPU jitter can cause frame drops and stuttering.
+- In cloud infrastructure that can pause the VM or container for a small duration to perform operations at the host.
+
+## Charts
+
+idlejitter.plugin generates the idlejitter chart which measures CPU idle jitter in milliseconds lost per second. 
+
+## Configuration
+
+This chart is available without any configuration. 
+
+