The problem

New Relic Plug handler fails to process certain telemetry events due to a :badkey error. This results in the handler being detached and further telemetry collection disrupted. I am using Bandit v1.5

Logs

Log: [error] Handler {:new_relic, :plug} has failed and has been detached. Class=:error
Reason: {:badkey, :conn,
%{
  telemetry_span_context: #Reference<0.1763085910.242745346.37981>,
  connection_telemetry_span_context: #Reference<0.1763085910.242745346.7102>
}}

Stacktrace:
[
  {NewRelic.Telemetry.Plug, :get_headers, 2,
   [file: "lib/new_relic/telemetry/plug.ex", line: 272]},
  {NewRelic.Telemetry.Plug, :handle_event, 4,
   [file: "lib/new_relic/telemetry/plug.ex", line: 102]},
  {:telemetry, :"execute/3-fun-0", 4,
   [file: "/app/deps/telemetry/src/telemetry.erl", line: 167]},
  {:lists, :foreach_1, 2, [file: "lists.erl", line: 1686]},
  {Bandit.Telemetry, :start_span, 3, [file: "lib/bandit/telemetry.ex", line: 168]},
  {Bandit.Pipeline, :run, 4, [file: "lib/bandit/pipeline.ex", line: 53]},
  {Bandit.HTTP1.Handler, :handle_data, 3,
   [file: "lib/bandit/http1/handler.ex", line: 12]},
  {Bandit.DelegatingHandler, :handle_data, 3,
   [file: "lib/bandit/delegating_handler.ex", line: 18]}
]

Environment

• (elixir: "~> 1.14",)
• {:phoenix, "~> 1.7.14"}
• {:new_relic_agent, "~> 1.30.0"}
• {:new_relic_oban, "~> 0.0.2"}
• {:bandit, "~> 1.5"}

Is there to gracefully handle that scenario ? Is there more logging that we need to figure this out ?

Any help would be much appreciated