Metrics are the means by which the software quality can be 
measured. they give you confidence in the product. You may 
consider these product management indicators, which can be 
either quantitative or qualitative. They are typically the 
providers of the visibility you need.

There can be different metrices for different stages of 
software testing.
Few which can be listed down are: Test Report, Test Plan, 
Test Logs, Test Coverage, Defects List etc.

Software testing metrics basically aims at the testing 
coverage and defect trends.. Basically we use 
1. Test Coverage matrix
2. Defect Contentment Effectiveness
3. Traceability Matrix

Software testing metrics basically aims at the testing 
coverage and defect trends.. Basically we use 
1. Test Coverage matrix
2. Defect Contentment Effectiveness
3. Traceability Matrix