Could you please explain the main difference between BufferSize and proposed BufferLostConnectionSize?

May be it is a bug... My settings for active agents:

BufferSend=5

BufferSize=65535

My host has 147 items and sends it every minute. I set BufferSize=65535 and thought, that if agent losts connection to server, it saves metrics for 65535/147=445 minutes in memory and after connection restored, it send metrics to server. But it doesn't work like I think.

I set my firewall for block packets to server at 11:23 and deleted this rule at 12:05. Please see screeshot, what happens.

Quoting documentation:

Parameter	Mandatory	Range	Default	Description
BufferSend	no	1-3600	5	Do not keep data longer than N seconds in buffer.

With BufferSend=5 I wouldn't expect to get graphs without gaps...

May be add to this description: Even if lost connection to server... And more interesting will be if we would have BufferLostConnectionSize. How do you think?

I think it would be more interesting if people could read what's already there in documentation.

Even if lost connection to server...

...and what if not lost? Zabbix agent does not keep connection alive, there is actually no way to tell if connection was lost or not.

I think it would be more interesting if people could read from beginning of request. Ahaha )

Simply I want, that active agent can buffers metrics for a long time, if it loses connection to server and sends metrics constantly, if all good. But now, it is impossible. Why?

After discussion with vjaceslavs I propose to add option BufferKeep=<seconds> that would allow keeping unsent buffer for configured time.

We will have to incease max value of BufferSize as 64K is not sufficient to keep data when connection is lost.

Many thanks. Wait.