YES, as tester you will participate in generate testing 
metrics, such as:

% of Test Cases Passed
% of Test Cases Failed
% of Test Cases Executed
% of Requirement Coverage gotten.
Total number of bug found
Total number of bug by section or module
Number of bug by regression rounds.
Bug Resolution Average Time
Comparision about bug open/bug close by day

And many more..

yes , metrics is very important for planning and tracking
the results while execution .

In metrics while execution  we will come to know the , if
there are n number of scripts or test cases for execution 

How many scripts executed so far?
Scripts Passed.
Scripts failed.

Based on the above question we will come to know how much we
covered and how much yet to? and r we meeting the targets?
etc so that we can plan easily.

Through metrics we can analyze the bug density also..

this metrics will help u while signoff of the project. There
u can give an details results to client like 
how many bugs identified? in different phases
Bugs closed? in different phases ...
Bugs open?...