refactor(example): improve code

Author: markuslf

check-plugins/example/example

@@ -31,9 +31,11 @@ except ImportError:
 __author__ = 'Linuxfabrik GmbH, Zurich/Switzerland'
 __version__ = '2025090701'
 
-DESCRIPTION = """A working Linuxfabrik monitoring plugin, written in Python 3, as a basis for
-                 further development, and much more text to help admins get this check up and
-                 running."""
+DESCRIPTION = """
+A working Linuxfabrik monitoring plugin, written in Python 3, as a basis for
+further development, and much more text to help admins get this check up and
+running.
+"""
 
 DEFAULT_WARN = 80
 DEFAULT_CRIT = 90
@@ -144,7 +146,15 @@ def main():
     # build the message
     state = lib.base.get_state(value, args.WARN, args.CRIT)
     msg += '{}% used{}'.format(value, lib.base.state2str(state, prefix=' '))
-    perfdata += lib.base.get_perfdata('usage_percent', value, '%', args.WARN, args.CRIT, 0, 100)
+    perfdata += lib.base.get_perfdata(
+        'cpu-usage',
+        cpu_usage,
+        uom='%',
+        warn=args.WARN,
+        crit=args.CRIT,
+        _min=0,
+        _max=100,
+    )
 
     # over and out
     lib.base.oao(msg, state, perfdata, always_ok=args.ALWAYS_OK)