E016 — Unsupported OTLP protocol

E016: Unsupported OTLP protocol

jackin' exports run telemetry over OTLP/gRPC only. This error means an OTLP endpoint is configured (OTEL_EXPORTER_OTLP_ENDPOINT or a per-signal variant) while OTEL_EXPORTER_OTLP_PROTOCOL (or a per-signal _PROTOCOL variable) requests a transport jackin' does not speak — typically http/protobuf or http/json. Rather than build an exporter that would silently never deliver, jackin' stops at startup.

What to try

• Set OTEL_EXPORTER_OTLP_PROTOCOL=grpc (the default for backends such as Parallax) and point OTEL_EXPORTER_OTLP_ENDPOINT at the gRPC endpoint, e.g. http://localhost:4317.
• Or unset the OTLP endpoint variables to disable export — jackin' then records the run to a local diagnostics file instead.

See also

• Run Telemetry — how to configure OTLP export and where a run is recorded.
• Pass --debug to any jackin command to enable diagnostic tracing.