Possible missing SSL configuration in Elixir Observability article

[flupke]

Hello, I've been reading your excellent article and decided to give LightStep a try.

I added the configuration from the article, but I get these errors, both in production and when running tests:

19:13:38.134 [debug] OTLP exporter failed to initialize: exception throw: {application_either_not_started_or_not_ready,
                     tls_certificate_check}
  in function  tls_certificate_check_shared_state:latest_shared_state_key/0 (/home/flupke/src/jitter/jitter.video/elixir_backend/deps/tls_certificate_check/src/tls_certificate_check_shared_state.erl, line 338)
  in call from tls_certificate_check_shared_state:get_latest_shared_state/0 (/home/flupke/src/jitter/jitter.video/elixir_backend/deps/tls_certificate_check/src/tls_certificate_check_shared_state.erl, line 320)
  in call from tls_certificate_check_shared_state:authoritative_certificate_values/0 (/home/flupke/src/jitter/jitter.video/elixir_backend/deps/tls_certificate_check/src/tls_certificate_check_shared_state.erl, line 126)
  in call from tls_certificate_check:options/1 (/home/flupke/src/jitter/jitter.video/elixir_backend/deps/tls_certificate_check/src/tls_certificate_check.erl, line 78)
  in call from opentelemetry_exporter:parse_endpoint/2 (/home/flupke/src/jitter/jitter.video/elixir_backend/deps/opentelemetry_exporter/src/opentelemetry_exporter.erl, line 326)
  in call from opentelemetry_exporter:endpoint/2 (/home/flupke/src/jitter/jitter.video/elixir_backend/deps/opentelemetry_exporter/src/opentelemetry_exporter.erl, line 298)
  in call from lists:filtermap_1/2 (lists.erl, line 1417)
  in call from opentelemetry_exporter:init/1 (/home/flupke/src/jitter/jitter.video/elixir_backend/deps/opentelemetry_exporter/src/opentelemetry_exporter.erl, line 194)

Traces are printing fine with DEBUG_OTEL though.

I tried to add tls_certificate_check to extra_applications but no luck.

Do you by any chance know how to solve this?

Cheers

[davydog187]

I'm glad you enjoyed it! Can you please share the versions of otel, as well as your elixir and OTP versions?

[davydog187]

Solution is in open-telemetry/opentelemetry-erlang#419

Let me know if you still have issues after following the suggestions in the thread!

[flupke]

Yep that's it thanks, the solution was to add opentelemetry_exporter before opentelemetry in the release applications:

[
  releases: [
    jitter_backend: [
      applications: [
        jitter_backend: :permanent,
        opentelemetry_exporter: :temporary,
        opentelemetry: :temporary
      ]
    ]
  ]
]

[davydog187]

Awesome, would you be interested in submitting a PR to update the blog post?

[flupke]

Sure here you go #18

[davydog187]

Thanks!