I’m trying to get Honeycomb set up with my Elixir/Phoenix app. I’ve been following the guide in this blog post by Dave Lucia as a starting place.

It seemed to be going OK, but my app won’t start when I deploy it to fly.io. The error I get from flyctl logs is:

2023-03-07T15:50:11Z app[20e7bcfd] lhr [info]
{
  "Kernel pid terminated",
  application_controller,
  "{application_start_failure,
    tls_certificate_check,
    {{shutdown,
      {failed_to_start_child,tls_certificate_check_shared_state,{{badmatch,{error,enoent}
    },
    [{pubkey_os_cacerts,get,0,
      [{file,\"pubkey_os_cacerts.erl\"},{line,38}]
      },
      {tls_certificate_check_shared_state,maybe_load_authorities_trusted_by_otp,3,
      [{file,\"/app/deps/tls_certificate_check/src/tls_certificate_check_shared_state.erl\"},{line,362}]
      },
      {tls_certificate_check_shared_state,new_shared_state,2,
      [{file,\"/app/deps/tls_certificate_check/src/tls_certificate_check_shared_state.erl\"},{line,335}]
      },
      {tls_certificate_check_shared_state,handle_shared_state_initialization,2,
      [{file,\"/app/deps/tls_certificate_check/src/tls_certificate_check_shared_state.erl\"},{line,262}]
      },
      {gen_server,try_dispatch,4,
      [{file,\"gen_server.erl\"},{line,1123}]
      },
      {gen_server,handle_msg,6,
      [{file,\"gen_server.erl\"},{line,1200}]
      },
      {proc_lib,init_p_do_apply,3,
      [{file,\"proc_lib.erl\"},{line,240}]
      }
    ]
    }}},
    {tls_certificate_check_app,start,[normal,[]]}}}"
}

tls_certificate_check is not something I’ve set up, it’s added as a dependency of OpenTelemetry. So I’m not sure what it’s looking for and not finding. As far as I’ve been able to find, that’s the only diagnostic info I can locate.

Googling hasn’t given me any directions to try, so I’m feeling a bit stuck. Can anyone suggest anything to look at?