stat: support -ojson option with srv resources

[Pothulapati]

Policy resources are already supported just like
any other resources. For srv, the newly unauthorized
field is missed in the json response.

This PR tries to fix that.

Output

on ⛵ kind-kind  linkerd2 on 🌱 taru [📦📝🤷‍] via 🐼 v1.16.8 via  via ⚙️ v1.55.0
➜ ./bin/go-run cli viz stat srv -n emojivoto -ojson                                                                      ~/work/linkerd2
[
  {
    "namespace": "emojivoto",
    "kind": "server",
    "name": "emoji-grpc",
    "success": 1,
    "rps": 2,
    "latency_ms_p50": 1,
    "latency_ms_p95": 1,
    "latency_ms_p99": 1,
    "tcp_open_connections": 0,
    "tcp_read_bytes_rate": 0,
    "tcp_write_bytes_rate": 0,
    "unauthorized": 0
  },
  {
    "namespace": "emojivoto",
    "kind": "server",
    "name": "prom",
    "success": null,
    "rps": null,
    "latency_ms_p50": null,
    "latency_ms_p95": null,
    "latency_ms_p99": null
  },
  {
    "namespace": "emojivoto",
    "kind": "server",
    "name": "voting-grpc",
    "success": 0.8833333333333333,
    "rps": 1,
    "latency_ms_p50": 1,
    "latency_ms_p95": 1,
    "latency_ms_p99": 1,
    "tcp_open_connections": 0,
    "tcp_read_bytes_rate": 0,
    "tcp_write_bytes_rate": 0,
    "unauthorized": 0
  },
  {
    "namespace": "emojivoto",
    "kind": "server",
    "name": "web-http",
    "success": 0.9576271186440678,
    "rps": 1.9666666666666666,
    "latency_ms_p50": 1,
    "latency_ms_p95": 5,
    "latency_ms_p99": 9,
    "tcp_open_connections": 0,
    "tcp_read_bytes_rate": 0,
    "tcp_write_bytes_rate": 0,
    "unauthorized": 0
  }
]

on ⛵ kind-kind  linkerd2 on 🌱 taru [📦📝🤷‍] via 🐼 v1.16.8 via  via ⚙️ v1.55.0took 2s
➜ ./bin/go-run cli viz stat saz -n emojivoto -ojson                                                                      ~/work/linkerd2
[
  {
    "namespace": "emojivoto",
    "kind": "serverauthorization",
    "name": "emoji-grpc",
    "success": 0.9666666666666667,
    "rps": 4,
    "latency_ms_p50": 1,
    "latency_ms_p95": 3,
    "latency_ms_p99": 5
  },
  {
    "namespace": "emojivoto",
    "kind": "serverauthorization",
    "name": "prom-prometheus",
    "success": null,
    "rps": null,
    "latency_ms_p50": null,
    "latency_ms_p95": null,
    "latency_ms_p99": null
  },
  {
    "namespace": "emojivoto",
    "kind": "serverauthorization",
    "name": "voting-grpc",
    "success": 0.8666666666666667,
    "rps": 1,
    "latency_ms_p50": 1,
    "latency_ms_p95": 1,
    "latency_ms_p99": 1
  },
  {
    "namespace": "emojivoto",
    "kind": "serverauthorization",
    "name": "web-public",
    "success": null,
    "rps": null,
    "latency_ms_p50": null,
    "latency_ms_p95": null,
    "latency_ms_p99": null
  }
]

Signed-off-by: Tarun Pothulapati [email protected]

[alpeb]

LGTM 👍