Fixes #1 and #23

[vincenzopalazzo]

This required deleting the old metrics directory and the new payload looks like the following one

{
   "channels_info": {},
   "color": "02bf81",
   "metric_name": "metric_one",
   "node_id": "032eccf880ef6acd49efb6c881c6fd81e2e381799f0ee012853016e6d6b9efe947",
   "os_info": {
      "architecture": "x86_64",
      "os": "Linux Mint",
      "version": "20.1 (Ulyssa)"
   },
   "timezone": "CEST",
   "up_time": [
      {
         "channels": 0,
         "event": "on_start",
         "forwards": {
            "completed": 0,
            "failed": 0
         },
         "timestamp": 1627301916
      }
  

Fixes #1
Fixes #23