Public bug reported:

When you open the ganglia webfrontend in a browser there is nothing
displayed in the cluster report. The host views work. There should be an
overview of the cluster.

/var/log/apache2/error.log:
PHP Fatal error:  Uncaught Error: [] operator not supported for strings in 
/usr/share/ganglia-webfrontend/cluster_view.php:34\nStack trace:\n#0 
/usr/share/ganglia-webfrontend/cluster_view.php(757): get_picker_metrics(Array, 
Array, '/usr/share/gang...', 'rrdtool')\n#1 
/usr/share/ganglia-webfrontend/index.php(51): 
include_once('/usr/share/gang...')\n#2 {main}\n  thrown in 
/usr/share/ganglia-webfrontend/cluster_view.php on line 34, referer: 
https://monitoring/ganglia/

Description:    Ubuntu 18.04.2 LTS
Release:        18.04
ganglia-webfrontend:
  Installed: 3.6.1-3
  Candidate: 3.6.1-3
  Version table:
 *** 3.6.1-3 500
        500 http://de.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://de.archive.ubuntu.com/ubuntu bionic/universe i386 Packages
        100 /var/lib/dpkg/status

** Affects: ganglia-web (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1822048

Title:
  cluster report not displayed

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