Apache2 ARM 4.0 instrumentation (mod_arm4 module)

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The Apache web-server supports ARM4 now since end of 2004 by providing a specific ARM4 module called mod_arm4. We made some enhancements to this module which is available through our download page. Following is a brief list of our enhancements:

Enhancements

ARM metrics

Added an ARM metric called BytesSent which stores the bytes sent to the client of the requested document. With the length information of a requested document the response time can be normalised lets say milliseconds per kilo bytes for example.
Added an ARM metric called Status which is the HTTP status of the request.

ARM context properties

Application context properties which associates the following information to each application instance:
1. ServerVersion
2. ServerHost
3. ServerAdmin
Transaction context properties which associates the following information to each transaction measurement:
1. ServerName
2. ServerPort
3. RemoteAddress
4. RemoteUser
5. Scheme
6. QueryString
7. Protocol

ARM correlation

Added correlator information to the environment where CGI scripts can access it. Therefore it is possible to make a correlation between a HTTP-Request and the execution of an instrumented CGI script.
Configuration option which enables ARM measurements only if a correlator was sent by a client.

Miscellaneous

Added URI pattern matching support to selectively measure requests.
Added various configuration options to the module. Now you have much more control over the ARM instrumentation provided by mod_arm4 module.
Added arm_destroy_application() call to be more ARM 4.0 standard conform.
Added autoconf/automake infrastructure. Its possible to use configure/make as well as normal apxs script as used by apache modules. Further compile and installation instructions are included in the mod_arm4 distribution archive.
Support Apache 2.0.x and 2.2.x servers for compiling/building and deployment.