Add documentation for scraping prometheus metrics
Add documentation for scraping prometheus metrics

kubernetes/perf-tests,kubernetes/perf-tests,shyamjvs/perf-tests,kubernetes/perf-tests,kubernetes/perf-tests,shyamjvs/perf-tests,shyamjvs/perf-tests,shyamjvs/perf-tests,shyamjvs/perf-tests,kubernetes/perf-tests