Hello,
I have a use case in which I want to check if an FTP server is reachable and if a file has been updated the last x minutes.
I can´t really install an Agent on all the devices to check the file locally and remotely just the FTP server.
there are both check_ftp and check_sftp checks built-in with CheckMK. If your FTP server supports SFTP, you could use that check and then get at least the timestamp of your file and show it in the check output.