Rename "location"-flag to "namespace", update docs

contrib/scripts/isc_dhpcd_graphite/README.rst

@@ -15,12 +15,14 @@ Building the prefix
 ===================
 
 The dotted-path that graphite uses to store data is controlled by the prefix
-argument to the script (-p), the optional location argument (-l) and what
-``dhcpd_pool`` returns as its ``location`` key.
+argument to the script (-p), the optional namespace argument (-N) and what
+``dhcpd_pool`` returns as its ``location`` per entry of the ``shared_networks``
+list. (What ``dhcpd_pool`` calls "location" is elsewhere known as "DHCP network
+name".)
 
 The default prefix is "nav.dhcp".
 
-If ``-p`` is "nav.bloviate", ``-l`` is not set and the ``location`` in the json
+If ``-p`` is "nav.bloviate", ``-N`` is not set and the ``location`` in the json
 is "vlan1" the resulting graphite path is ``nav.bloviate.vlan1``.
 
 

contrib/scripts/isc_dhpcd_graphite/isc_dhpcd_graphite.py

@@ -56,7 +56,16 @@ def escape_metric_name(name):
 
 # parse comand line flags
 def parse_args():
-    parser = argparse.ArgumentParser(description="Send dhcp stats to graphite")
+    description = '''\
+        Send dhcp stats to graphite
+
+        The metric-name is taken from the location-field in the shared_networks
+        part of the output.
+    '''
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description=description,
+    )
     parser.add_argument(
         "server",
         help="Graphite server to send data to",
@@ -89,20 +98,20 @@ def parse_args():
         default=DEFAULT_PREFIX,
     )
     parser.add_argument(
-        "-l",
-        "--location",
+        "-N",
+        "--namespace",
         help=(
-            "Location, if any, to append to the metric prefix to build the path."
-            ' If the location is named "vlan1" and the location is "building1.cellar"'
-            " the resulting metric path would be PREFIX.building1.cellar.vlan1"
+            "Namespace, if any, to append to the metric prefix to build the path."
+            ' If the location is "vlan1" and the namespace is "building1.cellar"'
+            ' the resulting metric path would be "PREFIX.building1.cellar.vlan1"'
         ),
         type=str,
     )
     parser.add_argument(
         "--extract-vlan",
         help=(
             "Try to extract the name of a vlan from the location."
-            ' If the vlan is named "vlan1_baluba" '
+            ' If the location is "vlan1_baluba" '
             " the resulting metric path would be PREFIX.vlan1"
         ),
         action="store_true",