add cpu check

src/lego_monitoring/checks/__init__.py

@@ -1,2 +1,3 @@
+from .cpu import cpu_check
 from .temp import temp_check
 from .vulnix import vulnix_check

src/lego_monitoring/checks/cpu.py

@@ -0,0 +1,30 @@
+from psutil import cpu_percent
+
+from lego_monitoring.alerting import alerts
+from lego_monitoring.alerting.enum import AlertType, Severity
+from lego_monitoring.core import cvars
+
+IS_TESTING = False
+
+
+def cpu_check() -> list[alerts.Alert]:
+    percentage = cpu_percent()
+    config = cvars.config.get().checks.cpu
+    if config.critical_percentage and (IS_TESTING or percentage > config.critical_percentage):
+        return [
+            alerts.Alert(
+                alert_type=AlertType.CPU,
+                message=f"CPU load: {percentage:.2f}% > {config.critical_percentage:.2f}%",
+                severity=Severity.CRITICAL,
+            )
+        ]
+    elif config.warning_percentage and (IS_TESTING or percentage > config.warning_percentage):
+        return [
+            alerts.Alert(
+                alert_type=AlertType.CPU,
+                message=f"CPU load: {percentage:.2f}% > {config.warning_percentage:.2f}%",
+                severity=Severity.WARNING,
+            )
+        ]
+    else:
+        return []