docs: update cli args for logging

docs/references/cli-arguments.md

@@ -34,7 +34,6 @@ Following table describes all the flags that are available:
 | --admission-webhook-cert             |`string`   | none                            | PEM-encoded certificate string for TLS handshake.|
 | --admission-webhook-key              |`string`   | none                            | PEM-encoded private key string for TLS handshake.|
 | --admission-webhook-listen           |`string`   | `off`                           | The address to start admission controller on (ip:port). Setting it to 'off' disables the admission controller.|
-| --alsologtostderr                    |`boolean`  | `false`                         | Logs are written to standard error as well as to files.|
 | --anonymous-reports                  |`string`   | `true`                          | Send anonymized usage data to help improve Kong.|
 | --apiserver-host                     |`string`   | none                            | The address of the Kubernetes Apiserver to connect to in the format of protocol://address:port, e.g., "http://localhost:8080. If not specified, the assumption is that the binary runs inside a Kubernetes cluster and local discovery is attempted.|
 | --election-id                        |`string`   | `ingress-controller-leader`     | The name of ConfigMap (in the same namespace) to use to facilitate leader-election between multiple instances of the controller.|
@@ -51,22 +50,18 @@ Following table describes all the flags that are available:
 | --kong-url                           |`string`   | none                            | DEPRECATED, use `--kong-admin-url` |
 | --kong-workspace                     |`string`   | `default`                       | Workspace in Kong Enterprise to be configured.|
 | --kong-custom-entities-secret        |`string`   | none                            | Secret containing custom entities to be populated in DB-less mode, takes the form `namespace/name`.|
+| --log-format                         |`string`   | `text`                          | Format of logs of the controller. Allowed values are `text` and `json`. |
+| --log-level                          |`string`   | `info`                          | Level of logging for the controller. Allowed values are `trace`, `debug`, `info`, `warn`, `error`, `fatal` and `panic`. |
 | --enable-reverse-sync                |`bool`     | `false`                         | Enable reverse checks from Kong to Kubernetes. Use this option only if a human has edit access to Kong's Admin API. |
 | --kubeconfig                         |`string`   | none                            | Path to kubeconfig file with authorization and master location information.|
-| --log_backtrace_at                   |`string`   | none                            | When set to a file and line number holding a logging statement, such as -log_backtrace_at=gopherflakes.go:234 a stack trace will be written to the Info log whenever execution hits that statement. (Unlike with -vmodule, the ".go" must be present.)|
-| --log_dir                            |`string`   | none                            | If non-empty, write log files in this directory.|
-| --logtostderr                        |`boolean`  | `true`                          | Logs to standard error instead of files.|
 | --profiling                          |`boolean`  | `true`                          | Enable profiling via web interface `host:port/debug/pprof/`. |
 | --publish-service                    |`string`   | none                            | The namespaces and name of the Kubernetes Service fronting Kong Ingress Controller in the form of namespace/name. The controller will set the status of the Ingress resouces to match the endpoints of this service. In reference deployments, this is kong/kong-proxy.|
 | --publish-status-address             |`string`   | none                            | User customized address to be set in the status of ingress resources. The controller will set the endpoint records on the ingress using this address.|
-| --stderrthreshold                    |`string`   | `2`                             | logs at or above this threshold go to stderr.|
 | --sync-period                        |`duration` | `10m`                           | Relist and confirm cloud resources this often.|
 | --sync-rate-limit                    |`float32`  | `0.3`                           | Define the sync frequency upper limit. |
 | --update-status                      |`boolean`  | `true`                          | Indicates if the ingress controller should update the Ingress status IP/hostname.|
 | --update-status-on-shutdown          |`boolean`  | `true`                          | Indicates if the ingress controller should update the Ingress status IP/hostname when the controller is being stopped.|
-|  -v, --v Level                        `int`      | `0`                             | | Enable V-leveled logging at the specified level.|
 | --version                            |`boolean`  | `false`                         | Shows release information about the Kong Ingress controller.|
-| --vmodule moduleSpec                 |`string`   | none                            | The syntax of the argument is a comma-separated list of pattern=N, where pattern is a literal file name (minus the ".go" suffix) or "glob" pattern and N is a V level. For instance, -vmodule=gopher*=3 sets the V level to 3 in all Go files whose names begin "gopher".|
 | --watch-namespace                    |`string`   | none                            | Namespace to watch for Ingress and custom resources. The default value of an empty string results in the controller watching for resources in all namespaces and configuring Kong accordingly.|
 | --help                               |`boolean`  | `false`                         | Shows this documentation on the CLI and exit.|