log[] and logrt[] items repeatedly reread log file from the beginning if file system is 100% full and the log file is being appended

If a file system with log files is 100% full and new records are being written into a log file it results in a log file not changing its size anymore but constantly updating its modification time. Zabbix agent waits a little time in a hope that things will stabilize but in the end concludes that file has been overwritten and reanalyzes it from the start. All matching lines are sent to server again. This cycle repeats until situation is resolved.