What's Changed

• fix(langchain): do not stringify metadata unnecessarily by @hassiebp in #1237
• chore: add good .env defaults by @nimarb in #1239
• fix(openai): add check for metadata NotGiven by @hassiebp in #1240
• fix(scores): skip sampling if OTEL sampler not available by @hassiebp in #1241
• fix(dataset-run-items): correctly typ datasetRunItems.list by @hassiebp in #1242

Full Changelog: v3.1.1...v3.1.2