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: "cups.plugin"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/collectors/cups.plugin/README.md
+-->
+
+# cups.plugin
+
+`cups.plugin` collects Common Unix Printing System (CUPS) metrics.
+
+## Prerequisites
+
+This plugin needs a running local CUPS daemon (`cupsd`). This plugin does not need any configuration. Supports cups since version 1.7.
+
+If you installed Netdata using our native packages, you will have to additionaly install `netdata-plugin-cups` to use this plugin for data collection. It is not installed by default due to the large number of dependencies it requires.
+
+## Charts
+
+`cups.plugin` provides one common section `destinations` and one section per destination.
+
+> Destinations in CUPS represent individual printers or classes (collections or pools) of printers (<https://www.cups.org/doc/cupspm.html#working-with-destinations>)
+
+The section `server` provides these charts:
+
+1.  **destinations by state**
+
+    -   idle
+    -   printing
+    -   stopped
+
+2.  **destinations by options**
+
+    -   total
+    -   accepting jobs
+    -   shared
+
+3.  **total job number by status**
+
+    -   pending
+    -   processing
+    -   held
+
+4.  **total job size by status**
+
+    -   pending
+    -   processing
+    -   held
+
+For each destination the plugin provides these charts:
+
+1.  **job number by status**
+
+    -   pending
+    -   held
+    -   processing
+
+2.  **job size by status**
+
+    -   pending
+    -   held
+    -   processing
+
+At the moment only job status pending, processing, and held are reported because we do not have a method to collect stopped, canceled, aborted and completed jobs which scales.
+
+