Add gtmetrics script

gtmetrics.py

@@ -0,0 +1,41 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+import sys
+import collections
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Parses a GlobalTalk data JSON into Prometheus Metrics"
+    )
+    parser.add_argument("filename", help="Path to the JSON file")
+    parser.add_argument("--output", type=argparse.FileType("w"), default=sys.stdout)
+    args = parser.parse_args()
+
+    try:
+        with open(args.filename, "r", encoding="utf-8") as file:
+            globaltalk_data = json.load(file)
+    except FileNotFoundError:
+        print(f"Error: File '{args.filename}' not found.")
+    except json.JSONDecodeError as e:
+        print(f"Error: Failed to decode JSON - {e}")
+
+    # Nodes per zone
+    zone_counts = collections.Counter(node.get("zone", "Unknown") for node in globaltalk_data['nodes'])
+    for k, v in zone_counts.items():
+        args.output.write('global_talk_zone_devices{{zone="{0}"}} {1}\n'.format(k, v))
+
+    # Count of device types
+    device_type_counts = collections.Counter(node.get("type", "Unknown") for node in globaltalk_data['nodes'])
+    for k, v in device_type_counts.items():
+        args.output.write('global_talk_device_types{{type="{0}"}} {1}\n'.format(k, v))
+
+    # jRouter versions
+    jrouter_versions = collections.Counter(node.get("object", "Unknown") for node in globaltalk_data['nodes'] if node.get("object", "Unknown").startswith('jrouter'))
+    for k, v in jrouter_versions.items():
+        args.output.write('global_talk_jrouter_versions{{version="{0}"}} {1}\n'.format(k.replace('jrouter ', ''), v))
+
+if __name__ == "__main__":
+    main()