for i in {1..100}; do wget -q -O /dev/null --tries 1 [hostname] || echo FAIL; done | grep -c FAIL

..or...

ab -n 1000 [hostname] > ab.txt

for ab you need to apt-get install apache2-utils

...or...

ping -A -c 100 [hostname]

will print a summary at the end

...or...

server-status is enabled by mod_status.
See http://httpd.apache.org/docs/current/mod/mod_status.html
See http://httpd.apache.org/server-status for an example.

Monitor stuff on the server: tcpdump -n ip host [client_ip] and tcp port 80 > test

...or...

Try mtr