Tried redownloading and installing fog as its pretty easy and straightforward however still same issue.
[Tue May 25 00:00:04.404259 2021] [mpm_prefork:notice] [pid 801] AH00163: Apache/2.4.41 (Ubuntu) OpenSSL/1.1.1f configured -- resuming normal operations
[Tue May 25 00:00:04.404282 2021] [core:notice] [pid 801] AH00094: Command line: '/usr/sbin/apache2'
[Wed May 26 00:00:06.516283 2021] [mpm_prefork:notice] [pid 801] AH00171: Graceful restart requested, doing restart
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Mon May 24 00:00:07.495210 2021] [mpm_prefork:notice] [pid 801] AH00163: Apache/2.4.41 (Ubuntu) OpenSSL/1.1.1f configured -- resuming normal operations
[Mon May 24 00:00:07.495231 2021] [core:notice] [pid 801] AH00094: Command line: '/usr/sbin/apache2'
[Tue May 25 00:00:03.853271 2021] [mpm_prefork:notice] [pid 801] AH00171: Graceful restart requested, doing restart
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
[Thu May 20 00:00:07.690477 2021] [mpm_prefork:notice] [pid 801] AH00163: Apache/2.4.41 (Ubuntu) OpenSSL/1.1.1f configured -- resuming normal operations
[Thu May 20 00:00:07.690497 2021] [core:notice] [pid 801] AH00094: Command line: '/usr/sbin/apache2'
[Thu May 20 14:46:05.550377 2021] [proxy:error] [pid 901639] (111)Connection refused: AH00957: FCGI: attempt to connect to 127.0.0.1:9000 (*) failed
[Thu May 20 14:46:05.556623 2021] [proxy_fcgi:error] [pid 901639] [client 192.168.0.254:49042] AH01079: failed to make connection to backend: 127.0.0.1
[Thu May 20 14:46:05.575487 2021] [proxy:error] [pid 901622] (111)Connection refused: AH00957: FCGI: attempt to connect to 127.0.0.1:9000 (*) failed
[Thu May 20 14:46:05.575640 2021] [proxy_fcgi:error] [pid 901622] [client 192.168.0.254:49043] AH01079: failed to make connection to backend: 127.0.0.1
[Thu May 20 14:46:07.616286 2021] [proxy:error] [pid 901620] (111)Connection refused: AH00957: FCGI: attempt to connect to 127.0.0.1:9000 (*) failed
[Thu May 20 14:46:07.616353 2021] [proxy_fcgi:error] [pid 901620] [client 192.168.0.254:49065] AH01079: failed to make connection to backend: 127.0.0.1
[Thu May 20 14:46:08.280219 2021] [mpm_prefork:notice] [pid 801] AH00169: caught SIGTERM, shutting down
[Thu May 20 14:46:42.725606 2021] [mpm_prefork:notice] [pid 801] AH00163: Apache/2.4.41 (Ubuntu) OpenSSL/1.1.1f configured -- resuming normal operations
[Thu May 20 14:46:42.760133 2021] [core:notice] [pid 801] AH00094: Command line: '/usr/sbin/apache2'
[Thu May 20 15:49:43.614999 2021] [proxy_fcgi:error] [pid 1133] [client 192.168.0.93:49784] AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to a member function isValid() on null in /var/www/html/fog/lib/fog/host.class.php:305\nStack trace:\n#0 /var/www/html/fog/lib/fog/fogbase.class.php(1832): Host->save()\n#1 /var/www/html/fog/lib/client/fogclient.class.php(179): FOGBase->sendData()\n#2 /var/www/html/fog/service/register.php(32): FOGClient->__construct()\n#3 {main}\n thrown in /var/www/html/fog/lib/fog/host.class.php on line 305'
[Thu May 20 15:56:04.356205 2021] [proxy_fcgi:error] [pid 1896] [client 192.168.0.95:49766] AH01071: Got error 'PHP message: PHP Fatal error: Uncaught Error: Call to a member function isValid() on null in /var/www/html/fog/lib/fog/host.class.php:305\nStack trace:\n#0 /var/www/html/fog/lib/fog/fogbase.class.php(1832): Host->save()\n#1 /var/www/html/fog/lib/client/fogclient.class.php(179): FOGBase->sendData()\n#2 /var/www/html/fog/service/register.php(32): FOGClient->__construct()\n#3 {main}\n thrown in /var/www/html/fog/lib/fog/host.class.php on line 305'
[Fri May 21 00:00:10.688815 2021] [mpm_prefork:notice] [pid 801] AH00171: Graceful restart requested, doing restart
AH00558: apache2: Could not reliably determine the server's fully qualified domain name, using 127.0.1.1. Set the 'ServerName' directive globally to suppress this message
I found some other files that were compressed please find above.
The php7.4 log is all the same as posted before