**Deprecation notice**: The following environment variable names have changed. The old names are deprecated. See #969 for more details.
| Old Name | New Name |
| ---------------------------------------------- | ---------------------------------------------------- |
| `DD__ANALYTICS_ENABLED` | `DD_TRACE__ANALYTICS_ENABLED` |
| `DD__ANALYTICS_SAMPLE_RATE` | `DD_TRACE__ANALYTICS_SAMPLE_RATE` |
| `DD_INTEGRATIONS_DISABLED` | `DD_TRACE__ENABLED` |
### Added
- Add `DD_TRACE_AGENT_URL` environment support #926 (thank you @nurcahyo!) #962
- Support for `DD_TRACE__` env vars #969
- Deeper instrumentation of Symfony 4.4 #967
### Fixed
- Move startup logging to first RINIT #961
- Fix propagation of `DD_ENV` and `DD_VERSION` to children spans #963
- Remove query string when new resource mapper is used #973