nicer graphs

system_monitor.py

@@ -14,7 +14,7 @@ import time
 DEFAULT_CONFIG = "/opt/cheap_system_monitor/monitor.conf"
 DS_NAMES = (
     "load1", "load5", "load15", "cpu_user", "cpu_system", "cpu_nice",
-    "net_in", "net_out", "disk_root", "disk_1", "disk_2", "memory",
+    "net_in", "net_out", "disk_root", "disk_1", "disk_2", "memory", "uptime",
 )
 
 
@@ -49,6 +49,7 @@ def create_rrd(path: Path) -> None:
         "DS:net_in:DERIVE:180:0:U", "DS:net_out:DERIVE:180:0:U",
         "DS:disk_root:GAUGE:180:0:100", "DS:disk_1:GAUGE:180:0:100",
         "DS:disk_2:GAUGE:180:0:100", "DS:memory:GAUGE:180:0:100",
+        "DS:uptime:GAUGE:180:0:U",
     ]
     # 1-minute data for a day, 5-minute data for two weeks, hourly for a year.
     archives = [
@@ -91,6 +92,11 @@ def memory_percent() -> float:
     return 100.0 * (total - available) / total
 
 
+def uptime_days() -> float:
+    seconds = float(Path("/proc/uptime").read_text().split()[0])
+    return seconds / 86400.0
+
+
 def disk_percent(mountpoint: str) -> float:
     stats = os.statvfs(mountpoint)
     used = stats.f_blocks - stats.f_bfree
@@ -124,7 +130,7 @@ def collect(config: configparser.SectionProxy) -> list[float | int | str]:
         raise SystemExit("At most three mountpoints are supported (including /)")
     disks: list[float | str] = [disk_percent(item) for item in mounts]
     disks.extend(["U"] * (3 - len(disks)))
-    return [*load, *cpu, *net, *disks, memory_percent()]
+    return [*load, *cpu, *net, *disks, memory_percent(), uptime_days()]
 
 
 def main() -> None: