Pick up bigger text file than 64K, vfs.file.contents, Zabbix Agent

The item vfs.file.contents is limited to 64K and so as the text field for MySQL engine.

Sometimes it's required to pick up bigger content from /proc/diskstats to pass this information to the preprocessor for example in "Template Module Linux block devices by Zabbix agent active"

The limitation is currently installed at the agent side. Please:

1) Increase the limit of item key 'vfs.file.contents' or 

2) Allow an override or

3) Invent a different agent key 

Currently to workaround issue must alter template "Template Module Linux block devices by Zabbix agent active" and use:

system.run["cat /proc/diskstats"]

which is not suitable for some environments.