Start os_mon in standalone runtimes

lib/livebook/runtime/erl_dist/node_manager.ex

@@ -35,6 +35,9 @@ defmodule Livebook.Runtime.ErlDist.NodeManager do
     * `:capture_orphan_logs` - whether to capture logs out of Livebook
       evaluator's scope. Defaults to `true`
 
+    * `:start_os_mon` - starts `:os_mon` for additional statistics in
+      LiveDashboard. Defaults to `false`
+
   """
   def start(opts \\ []) do
     GenServer.start(__MODULE__, opts, name: @name)
@@ -96,6 +99,7 @@ defmodule Livebook.Runtime.ErlDist.NodeManager do
     auto_termination = Keyword.get(opts, :auto_termination, true)
     parent_node = Keyword.get(opts, :parent_node)
     capture_orphan_logs = Keyword.get(opts, :capture_orphan_logs, true)
+    start_os_mon = Keyword.get(opts, :start_os_mon, false)
 
     ## Initialize the node
 
@@ -150,6 +154,10 @@ defmodule Livebook.Runtime.ErlDist.NodeManager do
 
     :net_kernel.monitor_nodes(true, node_type: :all)
 
+    if start_os_mon do
+      Application.ensure_all_started(:os_mon)
+    end
+
     {:ok,
      %{
        unload_modules_on_termination: unload_modules_on_termination,

lib/livebook/runtime/fly.ex

@@ -360,6 +360,7 @@ defmodule Livebook.Runtime.Fly do
 
   defp initialize_node(child_node) do
     init_opts = [
+      node_manager_opts: [start_os_mon: true],
       runtime_server_opts: [
         extra_smart_cell_definitions: Livebook.Runtime.Definitions.smart_cell_definitions()
       ]

lib/livebook/runtime/standalone.ex

@@ -60,6 +60,7 @@ defmodule Livebook.Runtime.Standalone do
 
     Utils.temporarily_register(self(), child_node, fn ->
       init_opts = [
+        node_manager_opts: [start_os_mon: true],
         runtime_server_opts: [
           extra_smart_cell_definitions: Livebook.Runtime.Definitions.smart_cell_definitions()
         ]