Service retries meaning

Hi, it’s not really clear for me how service retries work.
I have a service configured and an upstream with two targets.

_format_version: '1.1'

services:
- name: my-service
  host: my-upstream
  port: 8000
  protocol: http
  retries: 3
  routes:
  - name: my-route
    paths:
    - /

upstreams:
- name: my-upstream
  targets:
  - target: 192.168.3.23:10102
    weight: 50
  - target: 192.168.3.28:10102
    weight: 50
  healthchecks:
    active:
      concurrency: 100
      healthy:
        http_statuses:
        - 200
        - 302
        interval: 1
        successes: 1
      http_path: /testKong
      timeout: 1
      type: http
      unhealthy:
        http_failures: 3
        http_statuses:
        - 429
        - 404
        - 500
        - 501
        - 502
        - 503
        - 504
        - 505
        interval: 1
        tcp_failures: 3
        timeouts: 3
    passive:
      healthy:
        http_statuses:
        - 200
        - 201
        - 202
        - 203
        - 204
        - 205
        - 206
        - 207
        - 208
        - 226
        - 300
        - 301
        - 302
        - 303
        - 304
        - 305
        - 306
        - 307
        - 308
        successes: 1
      type: http
      unhealthy:
        http_failures: 1
        http_statuses:
        - 429
        - 500
        - 503
        tcp_failures: 1
        timeouts: 1
  slots: 100

What does “retries: 3” imply? I do not see that kind of behaviour in logs. The request is proxied and it has a healthy or unhealthy code as response and that’s all (so it seems it does just one retry, it does not retry on the second target if the first fails with 500 for example).

Thanks a lot.


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