lite-bootstrap wires production observability — OpenTelemetry, Prometheus, Sentry, and structlog — into FastAPI, Litestar, FastStream, and FastMCP services in a few lines, with no boilerplate.
With lite-bootstrap, you receive an application with lightweight built-in support for:
sentryprometheusopentelemetrypyroscope- with OpenTelemetry trace-profile linkingstructlogcorsswagger- with additional offline version supporthealth-checks
Those instruments can be bootstrapped for:
Lifecycle constraints
A few constraints that aren't obvious from the API:
- One bootstrapper per application instance. Constructing two
FastAPIBootstrappers around the samefastapi.FastAPI(or twoFastMcpBootstrappers around the sameFastMCP) is not supported. The second bootstrapper warns at construction, and itsbootstrap()raisesConfigurationError. - One
OpenTelemetryInstrumentper process.bootstrap()callsopentelemetry.trace.set_tracer_provider(...), which the OTel SDK enforces as set-once — subsequent calls log a warning and have no effect.teardown()flushes spans and closes exporters but can't reset the process-global pointer. teardown()is idempotent.BaseBootstrapper.teardown()short-circuits if not bootstrapped; per-instrument teardown methods are safe to call multiple times.- Partial teardown failures are aggregated. If an instrument's teardown raises, the bootstrapper continues with the rest of the instruments and raises
TeardownErrorat the end with all collected failures.
Usage examples:
- with Litestar - litestar-sqlalchemy-template
- with FastAPI - fastapi-sqlalchemy-template
Acknowledgements
lite-bootstrap is inspired by microbootstrap — a single package that wires up the common observability stack (sentry, prometheus, opentelemetry, logging, cors, swagger, health-checks) for FastAPI / Litestar / FastStream services and for plain scripts.
The following ideas were borrowed:
- the overall surface — a
Bootstrapperper framework that composes a set of instruments, - the lifecycle model — each instrument has
bootstrap()/teardown()/is_ready()and is skipped when its optional dependency is not installed, - the catalog of supported instruments and supported frameworks.
The following intentionally differ:
- Configuration:
lite-bootstrapuses frozendataclassconfigs (nopydantic/pydantic-settingsruntime dependency), which is what makes it "lite".microbootstrapconfigures everything throughpydantic-settingsmodels. - Granular extras:
lite-bootstraphas exactly one mandatory runtime dependency, the pure-Pythontyping-extensions; every instrument (sentry,otl,logging,pyroscope) and every framework (fastapi,litestar,faststream,fastmcp) is its own extra, plus an opt-inorjsonspeedup for logging, per-pair combos (fastapi-sentry,litestar-otl,faststream-metrics, …) and*-allrollups. You install only what you actually use. It also runs on free-threaded CPython 3.14t: every extra whose dependencies are pure Python installs there, and the ones that don't are blocked upstream —orjsonandpyroscopehave no free-threaded wheels, andotlneedsgrpcio, so useotl-httpinstead.microbootstrapbundles the full observability stack (opentelemetry, sentry-sdk, structlog, pyroscope-io, rich, pydantic-settings, …) as base dependencies and only splits framework packages into extras. - Scope:
lite-bootstrapis deliberately narrow — only instrument wiring. It does not include a Granian server runner or a console writer.
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📝 License
Part of modern-python
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Release files for lite-bootstrap 1.12.0
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