Hostname - possibility to identify actual CF's app instance?

[krismarc]

Hey there,

Seems like CF's api is unaware of actual hostnames of application processes.

Wouldn't it be beneficial to have hostname included in eg stats? So we can easily identify instance to eg. restart specific instance only.

Since we know host IP and other container attributes, this wouldn't probably cost any additional processing time, no?

cf curl /v3/processes/94f9a32a-8c89-4d6d-bcac-fcd9b489c20c/stats | jq -r .
{
  "resources": [
    {
      "type": "web",
      "index": 0,
      "state": "RUNNING",
      "routable": true,
      "host": "100.106.178.59",
      "instance_internal_ip": "11.254.97.6",
      "uptime": 873203,
      "mem_quota": 2147483648,
      "disk_quota": 10737418240,
      "log_rate_limit": -1,
      "fds_quota": 16384,
      "isolation_segment": null,
      "details": null,
      "instance_ports": [
        {
          "external": 0,
          "internal": 8080,
          "external_tls_proxy_port": 61002,
          "internal_tls_proxy_port": 61001
        },
        {
          "external": 0,
          "internal": 8080,
          "external_tls_proxy_port": null,
          "internal_tls_proxy_port": 61443
        },
        {
          "external": 0,
          "internal": 2222,
          "external_tls_proxy_port": 61003,
          "internal_tls_proxy_port": 61002
        }
      ],
      "usage": {
        "time": "2025-06-04T10:12:53+00:00",
        "cpu": 0.006661531415403901,
        "cpu_entitlement": 0.07833967451462209,
        "mem": 639707986,
        "disk": 1208496128,
        "log_rate": 1073
      }
    },
    {
      "type": "web",
      "index": 1,
      "state": "RUNNING",
      "routable": true,
      "host": "100.106.210.23",
      "instance_internal_ip": "11.249.24.8",
      "uptime": 886817,
      "mem_quota": 2147483648,
      "disk_quota": 10737418240,
      "log_rate_limit": -1,
      "fds_quota": 16384,
      "isolation_segment": null,
      "details": null,
      "instance_ports": [
        {
          "external": 0,
          "internal": 8080,
          "external_tls_proxy_port": 61007,
          "internal_tls_proxy_port": 61001
        },
        {
          "external": 0,
          "internal": 8080,
          "external_tls_proxy_port": null,
          "internal_tls_proxy_port": 61443
        },
        {
          "external": 0,
          "internal": 2222,
          "external_tls_proxy_port": 61008,
          "internal_tls_proxy_port": 61002
        }
      ],
      "usage": {
        "time": "2025-06-04T10:12:53+00:00",
        "cpu": 0.004324711435490253,
        "cpu_entitlement": 0.0508586487237521,
        "mem": 555906599,
        "disk": 1151676416,
        "log_rate": 0
      }
    }
  ]
}

[krismarc]

I just had a brief look at the code:

The isntance guid seems to be known already? https://github.com/cloudfoundry/cloud_controller_ng/blob/b328c8f22a8ebcef698d102ffbc995481b1d2c05/lib/cloud_controller/diego/reporters/instances_stats_reporter.rb#L79

and it's just not presented? https://github.com/cloudfoundry/cloud_controller_ng/blob/b328c8f22a8ebcef698d102ffbc995481b1d2c05/app/presenters/v3/process_stats_presenter.rb#L41

[krismarc]

ah, seems like this was added in 3.191 😃 and we are not yet there.. https://github.com/cloudfoundry/cloud_controller_ng/commit/f50766e85545feff582be64788638cfc9abc0b09