Telemetry

LiveView currently exposes the following telemetry events:

[:phoenix, :live_view, :mount, :start] - Dispatched by a Phoenix.LiveView immediately before mount/3 is invoked.

Measurement:
```
%{system_time: System.monotonic_time}
```

Metadata:

%{
  socket: Phoenix.LiveView.Socket.t,
  params: unsigned_params | :not_mounted_at_router,
  session: map,
  uri: String.t() | nil
}

[:phoenix, :live_view, :mount, :stop] - Dispatched by a Phoenix.LiveView when the mount/3 callback completes successfully.

Measurement:
```
%{duration: native_time}
```

Metadata:

%{
  socket: Phoenix.LiveView.Socket.t,
  params: unsigned_params | :not_mounted_at_router,
  session: map,
  uri: String.t() | nil
}

[:phoenix, :live_view, :mount, :exception] - Dispatched by a Phoenix.LiveView when an exception is raised in the mount/3 callback.
- Measurement: %{duration: native_time}
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  kind: atom,
  reason: term,
  params: unsigned_params | :not_mounted_at_router,
  session: map,
  uri: String.t() | nil
}
```
[:phoenix, :live_view, :handle_params, :start] - Dispatched by a Phoenix.LiveView immediately before handle_params/3 is invoked.
- Measurement:
```
%{system_time: System.monotonic_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  params: unsigned_params,
  uri: String.t()
}
```
[:phoenix, :live_view, :handle_params, :stop] - Dispatched by a Phoenix.LiveView when the handle_params/3 callback completes successfully.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  params: unsigned_params,
  uri: String.t()
}
```
[:phoenix, :live_view, :handle_params, :exception] - Dispatched by a Phoenix.LiveView when an exception is raised in the handle_params/3 callback.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  kind: atom,
  reason: term,
  params: unsigned_params,
  uri: String.t()
}
```
[:phoenix, :live_view, :handle_event, :start] - Dispatched by a Phoenix.LiveView immediately before handle_event/3 is invoked.
- Measurement:
```
%{system_time: System.monotonic_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  event: String.t(),
  params: unsigned_params
}
```
[:phoenix, :live_view, :handle_event, :stop] - Dispatched by a Phoenix.LiveView when the handle_event/3 callback completes successfully.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  event: String.t(),
  params: unsigned_params
}
```
[:phoenix, :live_view, :handle_event, :exception] - Dispatched by a Phoenix.LiveView when an exception is raised in the handle_event/3 callback.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  kind: atom,
  reason: term,
  event: String.t(),
  params: unsigned_params
}
```
[:phoenix, :live_view, :render, :start] - Dispatched by a Phoenix.LiveView immediately before render/1 is invoked.
- Measurement:
```
%{system_time: System.monotonic_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  force?: boolean,
  changed?: boolean
}
```
[:phoenix, :live_view, :render, :stop] - Dispatched by a Phoenix.LiveView when the render/1 callback completes successfully.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  force?: boolean,
  changed?: boolean
}
```
[:phoenix, :live_view, :render, :exception] - Dispatched by a Phoenix.LiveView when an exception is raised in the render/1 callback.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  kind: atom,
  reason: term,
  force?: boolean,
  changed?: boolean
}
```
[:phoenix, :live_component, :update, :start] - Dispatched by a Phoenix.LiveComponent immediately before update/2 or a update_many/1 is invoked.

In the case ofupdate/2 it might dispatch one event for multiple calls.
- Measurement:
```
%{system_time: System.monotonic_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  component: atom,
  assigns_sockets: [{map(), Phoenix.LiveView.Socket.t}]
}
```
[:phoenix, :live_component, :update, :stop] - Dispatched by a Phoenix.LiveComponent when the update/2 or a update_many/1 callback completes successfully.

In the case ofupdate/2 it might dispatch one event for multiple calls. The sockets metadata contain the updated sockets.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  component: atom,
  assigns_sockets: [{map(), Phoenix.LiveView.Socket.t}],
  sockets: [Phoenix.LiveView.Socket.t]
}
```
[:phoenix, :live_component, :update, :exception] - Dispatched by a Phoenix.LiveComponent when an exception is raised in the update/2 or a update_many/1 callback.

In the case ofupdate/2 it might dispatch one event for multiple calls.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  kind: atom,
  reason: term,
  component: atom,
  assigns_sockets: [{map(), Phoenix.LiveView.Socket.t}]
}
```
[:phoenix, :live_component, :handle_event, :start] - Dispatched by a Phoenix.LiveComponent immediately before handle_event/3 is invoked.
- Measurement:
```
%{system_time: System.monotonic_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  component: atom,
  event: String.t(),
  params: unsigned_params
}
```
[:phoenix, :live_component, :handle_event, :stop] - Dispatched by a Phoenix.LiveComponent when the handle_event/3 callback completes successfully.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  component: atom,
  event: String.t(),
  params: unsigned_params
}
```
[:phoenix, :live_component, :handle_event, :exception] - Dispatched by a Phoenix.LiveComponent when an exception is raised in the handle_event/3 callback.
- Measurement:
```
%{duration: native_time}
```
- Metadata:
```
%{
  socket: Phoenix.LiveView.Socket.t,
  kind: atom,
  reason: term,
  component: atom,
  event: String.t(),
  params: unsigned_params
}
```
[:phoenix, :live_component, :destroyed] - Dispatched by a Phoenix.LiveComponent after it is destroyed. No measurement.
- Metadata:
  
  %{ socket: Phoenix.LiveView.Socket.t, component: atom, cid: integer(), live_view_socket: Phoenix.LiveView.Socket.t }