Custom munin plugin to count the number of instances of a process

Question

I have this munin plugin:

#!/bin/sh

if [ "$1" = "autoconf" ]; then
  # Test for requirements, and return "yes" if met, "no" if not met
  echo "yes"
  exit 0
fi

if [ "$1" = "config" ]; then
    echo "graph_title xrdp process count"
    echo "graph_vlabel count"
    echo "graph_category processes"
    echo "graph_info This graph shows the count of xrdp processes"
    echo "my_proc_count_dummy_var.label count"
    exit 0
fi

echo "my_proc_count_dummy_var.value $(pgrep -f -a xrdp | grep -c -e 'xrdp$')"

The problem is that it doesn't show output as integer , it's a counter but I have values that are not correct on the graphs and makes not sense.

For example:

I read some faq about integer/float values on munin and looked other solution based on other plugins, for example the psu_ plugin where the output is correct but I was not able to resolve the problem.

Maybe I need to delete (or in some way regenerate) the old data?

Thanks for the help