Zabbix trigger last N text values matches regexp

I presume you are reading or have read the Zabbix documentation. If you have not, you should keep it handy and refer to it.

First, Zabbix passive checks can only read one value at a time, so for performance reasons I'd use a custom written active check with zabbix_sender if you are going to be sending a lot of data. zabbix_sender can send as many values at a time as you have.

So as you can see from the zabbix_sender documentation, it simply accepts a plain text file with space-delimited values. It sounds like you can manage that part.

You pass a number of key-value pairs (e.g. myservice.onlineusers, myservice.pendingdocuments) along with their values.

On the Zabbix side, you'll create a template for your application, add items to it corresponding to each statistic you're monitoring, and then define graphs and triggers if you want to alert on any of them. The Zabbix documentation really does cover each of these in sufficient depth, though if it's your first time through you may want to slow down and search more carefully. The 2.0 documentation was reorganized to make things easier to find, so you may want to use that even if you're on a prior version of Zabbix; most things are still the same.

The fact that you are using zabbix_sender implies that these items are of type "Zabbix trapper". With trapper items, the graphing behavior you described above is expected.

Regular items of types like "Zabbix agent" and "Zabbix agent (active)" have update interval configured, so the frontend knows that data is expected to come, say, every 30 seconds. If there is no data for a period of 4 update intervals or so, the graphing tool does not draw lines for this period. So, in your case, if the items would be of any other type, the marked lines would not be drawn.

However, with trapper items, there is no update interval, so the frontend does not know how frequently data is expected to come. It may come each minute, each day, or at irregular intervals. So the current solution is to connect every two points in the graph, and extend the first and last values to the border of the graph.

The behavior may be improved in future under https://support.zabbix.com/browse/ZBX-3356 .