added load tests for vpa

[swastik959]

adds load test by making post requests for the vpa

output of kyverno-vpa.js-25vu-500it-logs.txt

  execution: local
     script: /script/script.js
     output: -

  scenarios: (100.00%) 1 scenario, 25 max VUs, 10m30s max duration (incl. graceful stop):
           * default: 500 iterations shared among 25 VUs (maxDuration: 10m0s, gracefulStop: 30s)

     ✓ verify response code of POST VPA is 201

     █ teardown

     checks.........................: 100.00% ✓ 500        ✗ 0
     data_received..................: 437 kB  659 kB/s
     data_sent......................: 188 kB  284 kB/s
     http_req_blocked...............: avg=1.18ms   min=327ns   med=647ns   max=59.76ms p(90)=999ns    p(95)=370.63µs
     http_req_connecting............: avg=51.2µs   min=0s      med=0s      max=1.95ms  p(90)=0s       p(95)=7.14µs
     http_req_duration..............: avg=30.47ms  min=7.72ms  med=28.92ms max=72.06ms p(90)=38ms     p(95)=44.23ms
       { expected_response:true }...: avg=30.47ms  min=7.72ms  med=28.92ms max=72.06ms p(90)=38ms     p(95)=44.23ms
     http_req_failed................: 0.00%   ✓ 0          ✗ 500
     http_req_receiving.............: avg=439.68µs min=26.3µs  med=76.77µs max=16.69ms p(90)=920.41µs p(95)=2.41ms
     http_req_sending...............: avg=312.2µs  min=45.37µs med=80.72µs max=28.97ms p(90)=544.57µs p(95)=1.07ms
     http_req_tls_handshaking.......: avg=1.07ms   min=0s      med=0s      max=53.6ms  p(90)=0s       p(95)=292.54µs
     http_req_waiting...............: avg=29.72ms  min=7.6ms   med=28.53ms max=67.71ms p(90)=36.72ms  p(95)=43.3ms
     http_reqs......................: 500     753.227004/s
     iteration_duration.............: avg=32.3ms   min=2.08µs  med=29.66ms max=91.97ms p(90)=43.73ms  p(95)=54.22ms
     iterations.....................: 500     753.227004/s
running (00m00.7s), 00/25 VUs, 500 complete and 0 interrupted iterations
default ✓ [ 100% ] 25 VUs  00m00.7s/10m0s  500/500 shared iters

[KhaledEmaraDev]

Good job writing your first test.
I think we want to test how the VPA would respond to another Pod being load tested. We don;t want to load test the API Server by creating a lot of VPAs.

[swastik959]

@KhaledEmaraDev please review it now if this is what you actually wanted ?