Customizing Listview Columns


This article was written for OP5 Monitor 6.2 and it can work for later versions as well if nothing else is stated.

Listing hosts is nice, but I want more

The default view of hosts (and other objects) are designed to give you a good overview, but can be tweaked to fit your workflow. Read on for some examples of why listviews are the best way to present data.

Start editing columns in your profile

We start by visiting the user page: click your name in the upper right corner of the screen. Now, you should edit the text field labelled Table Hosts under the Columns in listview heading.

Understanding what's possible

For every example here, copy the text and enter it to the Table Hosts field. Don't forget to save the changes by submitting the form for each change you do, then reload the Host Detail view to see the changes take effect.


"Name" = name

That's not very useful, is it? You just replaced all the regular columns with a single one, the host's name.

Let's go back a step:


Whenever you want to reset, just replace everything in the text area with default to get the original view back.

We will now try to define multiple columns:

"State" = state, "Name" = name, "Output" = plugin_output

Here we see that every column definition is separated by a comma (,), every column label is quoted ("Column") and the content of every column is on the right hand side of an equal sign (=). Don't forget to label every column. This is important enough to state again: Don't forget to label every column.

Let's continue by backtracing to default and adding links to every hostgroup our host is a member of

default, "Groups" = groups

OK, that was useful, let's make each group name a link as well:

default, "Groups" = implode( ", ", [ "<a href=\"/monitor/index.php/extinfo/details?hostgroup=" + urlencode(x) + "\">" + htmlescape(x) + "</a>" for x in groups ] )

Good for you, you just modified a large part of the user interface by builtin tools in Monitor! Read on to discover the whole collection of helpful tools at your hands.

Complete guide to column definitions

Copy each of these examples into your GUI and see what effect you get out of it.

"Properly labelled timestamp" = time(last_check)
"Style list items individually" = implode(" --- ", groups)
"Display sensitive data in HTML" = htmlescape(plugin_output)
"Style each numeric list item" = "<span style='background-color: " + idx(state, "green", "yellow", "red") + "; padding: 2px'>" + state + "</span>"

"Services" = implode(" ", [ "<div style=\"display: inline-block; padding: 0 0.2em; margin: 1px 0; background: "+idx(x[2] * (x[1]+1),"#DDDDDD","#CCFFCC","#FFFFCC","#FFDDCC","#F7EEDD")+"\">" + "<a href=\"/monitor/index.php/extinfo/details?host="+urlencode(name)+"&service="+urlencode(x[0])+"\">"+htmlescape(x[0])+"</a>" + "</div>" for x in services_with_info] )

Another example that has large impacts on how the information is made accessible:

"Services" = "<table><tr><th>Description</th><th>State</th></tr>" + implode( "", ["<tr><td style=\"background: "+idx(x[2] * (x[1]+1),"#DDDDDD","#CCFFCC","#FFFFCC","#FFDDCC","#FFEEDD")+"\">"+x[0]+"</td><td style=\"background: "+idx(x[2] * (x[1]+1),"#DDDDDD","#CCFFCC","#FFFFCC","#FFDDCC","#FFEEDD")+"\">"+idx(x[2] * (x[1]+1),"pending","ok","warning","critical","unknown")+"</td></tr>" for x in services_with_info]) + "</table>"
This next example shows that you can out of the box modify Monitor without resorting to third party solutions. This is the target outcome image found at

To get OP5 Monitor to display this image, this column definition should suffice:

default, "Services" = implode( "", ["<a href=\"/monitor/index.php/extinfo/details?host="+urlencode(name)+"&service="+urlencode(x[0])+"\"><span class=\"icon-16 x16-shield-"+idx(x[2] * (x[1]+1),"pending","ok","warning","critical","unknown")+"\"></span></a>" for x in services_with_info] )
Together with what you already learned, this should be enough for you to do some really fancy stuff to your interface.

Finding columns to display

You have already used columns such as name, state and plugin_output. The easiest way to find all other columns is by bringing up the graphical filter builder which is located in any listview: it's a filter icon located in the top right. Edit the filter to display.

[hosts] name = "monitor"

and anywhere outside the tex tarea. Now, click the drop-down that has the value of "name" - now you see all the columns available for hosts. This is what it looks like in the GUI:

Excluding columns

default, -alias

The example above would exclude the alias column from listviews.

Using custom variables

If you want to list a custom variable, you could use the following example:

default, "Section" = custom_variables.SECTION

You define custom columns in the configuration interface:

With that information specified, the listview will now look like this:

Services, servicegroups, hostgroups

Until now, we've only worked with hosts and a host's properties. You can, however, continue to edit other object types such as services. We recommend you to read through this document again and replace "host" with "service" wherever you read it, but also keeping your newly acquired knowledge about filter columns in mind.

I need more help

Feel free to post questions to the mailing list (register first at That same mailinglist would like to hear about what you just pulled off thanks to listviews. Thanks for helping us making a better product!