Nagvis crash due to missing dependency in rhel8 installer

CMK version : 1.6.0p6.cee
OS version : CentOS Linux release 8.0.1905 (Core) / Redhat 8

Error message :

Description of the problem : Call to undefined function json_decode()

The rhel8 installer misses the dependency for php-json.
Once the nagvis snapin is activated the Snapin breaks, the Nagvis page is not usable due to the error message seen above.

Once php-json is installed, everything works fine.

If you encounter this problem, use the following:

yum install php-json
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As long as it is not fixed in check_Mk:

If you encounter this problem, use the following:

yum install php-json
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