fix load balancing e2e test

[zirain]

#8349 didn't fix it at all
This PR refactor the e2e tests:

• Unify the backend for load balancing cases
• Add readinessProbe to app-backend-lb deployment to make sure all the pods ready before run traffic tests.

[netlify]

✅ Deploy Preview for cerulean-figolla-1f9435 canceled.

Name	Link
🔨 Latest commit	c669582
🔍 Latest deploy log	https://app.netlify.com/projects/cerulean-figolla-1f9435/deploys/69a106ae43e4160008e3b9e2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.83%. Comparing base (ed18c9c) to head (c669582).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8352   +/-   ##
=======================================
  Coverage   73.83%   73.83%           
=======================================
  Files         242      242           
  Lines       37064    37064           
=======================================
  Hits        27365    27365           
  Misses       7767     7767           
  Partials     1932     1932           

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[zhaohuabing]

Looks like the load balancing tests are still failing.

    --- FAIL: TestE2E/QueryParamsBasedConsistentHashLoadBalancing (67.62s)
        --- FAIL: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo1 (30.07s)
        --- PASS: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo2 (0.06s)
        --- FAIL: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo3 (30.07s)
        --- PASS: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo4 (0.06s)
        --- PASS: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo5 (0.07s)

[zirain]

Looks like the load balancing tests are still failing.

    --- FAIL: TestE2E/QueryParamsBasedConsistentHashLoadBalancing (67.62s)
        --- FAIL: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo1 (30.07s)
        --- PASS: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo2 (0.06s)
        --- FAIL: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo3 (30.07s)
        --- PASS: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo4 (0.06s)
        --- PASS: TestE2E/QueryParamsBasedConsistentHashLoadBalancing/combo5 (0.07s)

yeah, no idea why this happen.

[zhaohuabing]

Should we disable these tests for now? They're blocking CI.

[zirain]

let's disabled it.

[zhaohuabing]

Hi @Zirian — thanks for taking care of this.

Just FYI, in the community meeting, the conclusion was to give this a bit more time to resolve properly rather than disabling the tests, since this is an important feature that users rely on.

[zirain]

I have no idea why this happen, let me close this for someone know more.