Telemetry

[harunzengin]

I got the following error with Xandra.Telemetry.attach_default_handler:

 2023-10-12 12:01:10.744 module=telemetry pid=<0.2174.0> [error]: Handler "xandra-default-telemetry-handler" has failed and has been detached. Class=:error
 Reason={:case_clause, [:pool, :stopped]}
 Stacktrace=[
   {Xandra.Telemetry, :handle_event, 4,
    [file: ~c"lib/xandra/telemetry.ex", line: 129]},
   {:telemetry, :"-execute/3-fun-0-", 4,
    [file: ~c"/builds/vpp/vpp/deps/telemetry/src/telemetry.erl", line: 150]},
   {:lists, :foreach_1, 2, [file: ~c"lists.erl", line: 1442]},
   {Xandra.Cluster.Pool, :stop_pool, 2,
    [file: ~c"lib/xandra/cluster/pool.ex", line: 576]},
   {Xandra.Cluster.Pool, :handle_event, 4,
    [file: ~c"lib/xandra/cluster/pool.ex", line: 399]},
   {:gen_statem, :loop_state_callback, 11,
    [file: ~c"gen_statem.erl", line: 1428]},
   {:proc_lib, :init_p_do_apply, 3, [file: ~c"proc_lib.erl", line: 240]}
 ]