Tomcat – Does jmxremote affect tomcat performance

You shouldn't need to make any changes to the server.xml except to put Tomcat back to the default ports so Apache can handle port 80. The bulk of the work will be done through the Apache configuration files. I typically leave these outside of the httpd.conf and instead stick them into smaller config snippets under the <ServerRoot>/conf.d/ sub-directory.

Given your example of ourserver.ourcompany.com/app1 & ourserver.ourcompany.com/app2 I would I would assume a configuration something along the following:

<VirtualHost *:80>
    ServerName ourserver.ourcompany.com
    ErrorLog ...
    CustomLog ...

    [other VHost configurations]

    ProxyPass /app1 ajp://tomcat_hostname:8009/app1
    ProxyPassReverse /app1 ajp://tomcat_hostname:8009/app1

    ProxyPass /app2 ajp://tomcat_hostname:8009/app2
    ProxyPassReverse /app2 ajp://tomcat_hostname:8009/app2
</VirtualHost>

If you have multiple Tomcat servers clustered behind then you might want to look at setting up mod_balancer and moving the ajp:// to mod_balancer BalancerMember's and replace with the balancer:// URL that refers to the balancer configuration.

mod_status already does that for you. You just have to make sure to use ExtendedStatus. To see an example how it'd look like, refer to apache.org's server-status page.