Warn yourself when your linux server isn't restarted for a while after an update (Python)

This Python script inspects installed kernels on RHEL, CentOS, and Oracle Enterprise Linux (UEK) servers and alerts administrators if an updated kernel hasn’t been activated via reboot:

import subprocess
import datetime
import sys

# Get all installed UEK kernel packages
output = subprocess.check_output(["rpm", "-qa", "kernel-uek*"])
output = output.decode().strip().split("\n")

# Sort kernels by installation timestamp descending
output.sort(key=lambda x: subprocess.check_output(["rpm", "-q", "--queryformat", "%{INSTALLTIME}", x]))
output.reverse()

# Determine currently active kernel
active_kernel = subprocess.check_output(["uname", "-r"]).decode().strip()
active_kernel = "kernel-uek-" + active_kernel

if active_kernel == output[0]:
    print("Aktif kernel en guncel surumdedir.")
    sys.exit(0)
else:
    most_recent_install_date = subprocess.check_output(["rpm", "-q", "--queryformat", "%{INSTALLTIME}", output[0]])
    most_recent_install_date = datetime.datetime.fromtimestamp(int(most_recent_install_date))

    active_install_date = subprocess.check_output(["rpm", "-q", "--queryformat", "%{INSTALLTIME}", active_kernel])
    active_install_date = datetime.datetime.fromtimestamp(int(active_install_date))

    difference = (most_recent_install_date - active_install_date).days

    if difference > 30:
        print(f"Yeni kernel yuklemesinin uzerinden {difference} gun gecmistir. Etkinlestirmek icin sunucuyu yeniden baslatiniz.")
        sys.exit(2)
    elif difference > 7:
        print(f"Guncel kernel {difference} gun once yuklenmistir. Etkinlestirmek icin yeniden baslatabilirsiniz.")
        sys.exit(1)
    else:
        print(f"Guncel kernel {difference} gun once yuklenmistir.")