(Previously released as `v0.50.0`, then yanked due to https://github.com/pydantic/logfire/issues/367)
* **BREAKING CHANGES:** Separate sending to Logfire from using standard OTEL environment variables by alexmojaki in https://github.com/pydantic/logfire/pull/351. See https://logfire.pydantic.dev/docs/guides/advanced/alternative_backends/ for details. Highlights:
* `OTEL_EXPORTER_OTLP_ENDPOINT` is no longer just an alternative to `LOGFIRE_BASE_URL`. Setting `OTEL_EXPORTER_OTLP_ENDPOINT`, `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`, and/or `OTEL_EXPORTER_OTLP_METRICS_ENDPOINT` will set up appropriate exporters *in addition* to sending to Logfire, which must be turned off separately if desired. These are basic exporters relying on OTEL defaults. In particular they don't use our custom retrying logic.
* `LOGFIRE_BASE_URL` / `logfire.configure(base_url=...)` is now only intended for actual alternative Logfire backends, which are currently only available to Logfire developers, and unlike `OTEL_EXPORTER_OTLP_ENDPOINT` requires authenticating with Logfire.
* Pending spans are only sent to logfire-specific exporters.
* Add `capture_statement` to Redis instrumentation by Kludex in https://github.com/pydantic/logfire/pull/355