# What changed in launchdarkly-server-sdk

> 10 changes in launchdarkly-server-sdk 9 from its official release notes, upgrade guides and advisories: 1 deprecations. Each one cited. Sources checked 2026-10-20. HTML: https://unstale.sh/pypi/launchdarkly-server-sdk/

To see which of these apply to a repository, run `npx @unstale/cli init` in it.

## launchdarkly-server-sdk 9

### Deprecations

- The SDK warns that payload filtering has no effect with FDv2. (9.18.0) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.0)

### Behavior and default changes

- In FDv1, the SDK retries indefinitely after a data source failure instead of stopping permanently. (9.18.0) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.0)
- The SDK warns when used in a forked process without postfork. (9.18.0) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.0)

### Fixes and other changes

- Stream-init durations and FDv2 state windows now use monotonic clocks. (9.18.2) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.2)
- Reuses an in-flight big segment status poll instead of querying twice. (9.18.1) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.1)
- The cached-data evaluation warning is logged only once per client. (9.18.0) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.0)
- The SDK reads all items when a collection is empty. (9.18.0) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.0)
- Invalid values produce a warning and use the documented default. (9.18.0) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.0)
- A slow callback no longer reduces the repeating task wait duration. (9.18.0) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.0)
- The async client reports a distinct User-Agent. (9.18.0) — [release notes](https://github.com/launchdarkly/python-server-sdk/releases/tag/9.18.0)