What's Changed

Features

feat(dashboard): chart polish, hover interactivity, and cross-chart sync (LFE-10549) by @nkabardin in #14618
feat(web): polish media tags in json viewers by @wochinge in #14630
feat(trace): show tool call arguments on hover by @hassiebp in #14565
feat(redis): add optional TLS for Redis Sentinel by @Devenir-Glorieux in #13360
feat(agents): support targeted model price audits by @hassiebp in #14673
feat(agent): Mutating MCP calls & HITL by @bezbac in #14399
feat: V4 historic backfill background migrations by @Steffen911 in #14206

fix(assistant): better trace design by @nimarb in #14638
fix(v4): coarsen migration timeline buckets by @maxdeichmann in #14641
fix(openai-models): add gpt-5.5 and gpt-5.5-pro to model selector by @hassiebp in #14635
fix(otel): map GenAI IO on AI SDK spans by @hassiebp in #14655
fix(tracing): parse standalone Responses tool calls by @hassiebp in #14654
fix(datasets): show expected output on dataset item experiments page by @marliessophie in #14649
fix(shared): retry GCS signed-URL generation on transient signing failures by @vismaytiwari in #14637
fix(web): show fallback for failed media previews by @wochinge in #14662
fix(web): allow storage upload URLs in CSP by @wochinge in #14665
fix(trace): deduplicate observations by id so colliding ids can't crash trace load (LFE-10588) by @nkabardin in #14669
fix(tracing): avoid LangGraph for Responses tool calls by @hassiebp in #14671
fix(events): restore trace-level score filtering in v4 (LFE-10596) by @nkabardin in #14675
fix(trace): dedupe observations at the source so the detail panel matches the timeline (LFE-10588) by @nkabardin in #14678
fix(trace): decode unicode escapes in trace JSON download by @toyayuto in #14667
fix(experiments): thin x-axis ticks so long-name charts stop smearing (LFE-10583) by @nkabardin in #14670
fix(mcp): Enable filtering observations by metadata by @bezbac in #14584

chore(shared): tag dataset item write counts by @wochinge in #14639
refactor(web): Move LangfuseIcon to design-system folder by @bezbac in #14634
refactor(web): Move Switch to design-system folder by @bezbac in #14653
chore(pricing): update default model prices by @langfuse-bot in #14623
chore(worker): drop project_id tag from export volume metric for API integrations by @niklassemmler in #14656
chore(pricing): update default model prices by @langfuse-bot in #14664

Full Changelog: v3.202.1...v3.203.0