Release v4.0.0 (#1269)

Author: alexmojaki

CHANGELOG.md

@@ -1,5 +1,12 @@
 # Release Notes
 
+## [v4.0.0] (2025-07-22)
+
+**BREAKING CHANGES**:
+
+* Remove extra FastAPI spans by default by @alexmojaki in [#1268](https://github.com/pydantic/logfire/pull/1268)
+* Stop implicitly emitting deprecated process runtime metrics by @alexmojaki in [#932](https://github.com/pydantic/logfire/pull/932)
+
 ## [v3.25.0] (2025-07-18)
 
 * Use local timezone in console logging by @fswair in [#1255](https://github.com/pydantic/logfire/pull/1255)
@@ -801,3 +808,4 @@ First release from new repo!
 [v3.24.1]: https://github.com/pydantic/logfire/compare/v3.24.0...v3.24.1
 [v3.24.2]: https://github.com/pydantic/logfire/compare/v3.24.1...v3.24.2
 [v3.25.0]: https://github.com/pydantic/logfire/compare/v3.24.2...v3.25.0
+[v4.0.0]: https://github.com/pydantic/logfire/compare/v3.25.0...v4.0.0

logfire-api/logfire_api/_internal/integrations/fastapi.pyi

@@ -15,7 +15,7 @@ from typing import Any, Callable
 
 def find_mounted_apps(app: FastAPI) -> list[FastAPI]:
     """Fetch all sub-apps mounted to a FastAPI app, including nested sub-apps."""
-def instrument_fastapi(logfire_instance: Logfire, app: FastAPI, *, capture_headers: bool = False, request_attributes_mapper: Callable[[Request | WebSocket, dict[str, Any]], dict[str, Any] | None] | None = None, excluded_urls: str | Iterable[str] | None = None, record_send_receive: bool = False, extra_spans: bool = True, **opentelemetry_kwargs: Any) -> AbstractContextManager[None]:
+def instrument_fastapi(logfire_instance: Logfire, app: FastAPI, *, capture_headers: bool = False, request_attributes_mapper: Callable[[Request | WebSocket, dict[str, Any]], dict[str, Any] | None] | None = None, excluded_urls: str | Iterable[str] | None = None, record_send_receive: bool = False, extra_spans: bool = False, **opentelemetry_kwargs: Any) -> AbstractContextManager[None]:
     """Instrument a FastAPI app so that spans and logs are automatically created for each request.
 
     See `Logfire.instrument_fastapi` for more details.

logfire-api/logfire_api/_internal/integrations/system_metrics.pyi

@@ -4,7 +4,7 @@ from logfire import Logfire as Logfire
 from typing import Literal
 from typing_extensions import LiteralString
 
-MetricName: type[Literal['system.cpu.simple_utilization', 'system.cpu.time', 'system.cpu.utilization', 'system.memory.usage', 'system.memory.utilization', 'system.swap.usage', 'system.swap.utilization', 'system.disk.io', 'system.disk.operations', 'system.disk.time', 'system.network.dropped.packets', 'system.network.packets', 'system.network.errors', 'system.network.io', 'system.network.connections', 'system.thread_count', 'process.open_file_descriptor.count', 'process.context_switches', 'process.cpu.time', 'process.cpu.utilization', 'process.cpu.core_utilization', 'process.memory.usage', 'process.memory.virtual', 'process.thread.count', 'process.runtime.gc_count', 'process.runtime.memory', 'process.runtime.cpu.time', 'process.runtime.thread_count', 'process.runtime.cpu.utilization', 'process.runtime.context_switches']]
+MetricName: type[Literal['system.cpu.simple_utilization', 'system.cpu.time', 'system.cpu.utilization', 'system.memory.usage', 'system.memory.utilization', 'system.swap.usage', 'system.swap.utilization', 'system.disk.io', 'system.disk.operations', 'system.disk.time', 'system.network.dropped.packets', 'system.network.packets', 'system.network.errors', 'system.network.io', 'system.network.connections', 'system.thread_count', 'process.open_file_descriptor.count', 'process.context_switches', 'process.cpu.time', 'process.cpu.utilization', 'process.cpu.core_utilization', 'process.memory.usage', 'process.memory.virtual', 'process.thread.count', 'process.runtime.gc_count']]
 Config = dict[MetricName, Iterable[str] | None]
 CPU_FIELDS: list[LiteralString]
 MEMORY_FIELDS: list[LiteralString]

logfire-api/logfire_api/_internal/main.pyi

@@ -432,7 +432,7 @@ class Logfire:
     def instrument_pydantic_ai(self, obj: pydantic_ai.Agent | None = None, /, *, event_mode: Literal['attributes', 'logs'] = 'attributes', include_binary_content: bool | None = None, **kwargs: Any) -> None: ...
     @overload
     def instrument_pydantic_ai(self, obj: pydantic_ai.models.Model, /, *, event_mode: Literal['attributes', 'logs'] = 'attributes', include_binary_content: bool | None = None, **kwargs: Any) -> pydantic_ai.models.Model: ...
-    def instrument_fastapi(self, app: FastAPI, *, capture_headers: bool = False, request_attributes_mapper: Callable[[Request | WebSocket, dict[str, Any]], dict[str, Any] | None] | None = None, excluded_urls: str | Iterable[str] | None = None, record_send_receive: bool = False, extra_spans: bool = True, **opentelemetry_kwargs: Any) -> AbstractContextManager[None]:
+    def instrument_fastapi(self, app: FastAPI, *, capture_headers: bool = False, request_attributes_mapper: Callable[[Request | WebSocket, dict[str, Any]], dict[str, Any] | None] | None = None, excluded_urls: str | Iterable[str] | None = None, record_send_receive: bool = False, extra_spans: bool = False, **opentelemetry_kwargs: Any) -> AbstractContextManager[None]:
         """Instrument a FastAPI app so that spans and logs are automatically created for each request.
 
         Uses the [OpenTelemetry FastAPI Instrumentation](https://opentelemetry-python-contrib.readthedocs.io/en/latest/instrumentation/fastapi/fastapi.html)

logfire-api/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "logfire-api"
-version = "3.25.0"
+version = "4.0.0"
 description = "Shim for the Logfire SDK which does nothing unless Logfire is installed"
 authors = [
     { name = "Pydantic Team", email = "[email protected]" },

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "logfire"
-version = "3.25.0"
+version = "4.0.0"
 description = "The best Python observability tool! 🪵🔥"
 requires-python = ">=3.9"
 authors = [