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feat(webapp): add emission fan-out metrics to the native realtime feed - #4341
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WalkthroughAdds per-batch realtime emission fanout statistics to 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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ericallam
marked this pull request as ready for review
July 22, 2026 16:21
d-cs
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## Summary 2 new features, 9 improvements, 3 bug fixes. ## Highlights - Allow additional environment API keys to create scoped public access tokens through the Trigger.dev API. Use server-issued public access tokens for batch operations so environment-scoped API keys can read batch results. ([#4387](#4387)) ## Improvements - Preserve the partial assistant message when a chat turn's model stream fails mid-response. `chat.agent` now passes the recovered partial to `onTurnComplete`, and `chat.createSession`'s `turn.complete()` keeps it before rethrowing, instead of dropping the streamed-so-far output. ([#4348](#4348)) ## Server changes These changes affect the self-hosted Docker image and Trigger.dev Cloud: - Favorite any dashboard page to a new Favorites section in the side menu, and customize the sidebar by renaming favorites, hiding items, and reordering items and sections. ([#4375](#4375)) - List API endpoints now clamp the page size to a maximum of 100. Requests asking for a larger page size return up to 100 items and keep paginating, rather than pulling an unbounded page. ([#4360](#4360)) - Organizations without billing alerts now get default spend alert thresholds, so you're notified before usage grows unexpectedly. The billing limit page no longer pre-selects an option before you've set a limit and prompts you to configure one. Alert previews now update immediately after you change your billing limit. ([#4328](#4328)) - When you create a Personal Access Token, the generated token now shows its first and last few characters instead of being fully hidden, so you can confirm you copied the right value. ([#4363](#4363)) - Add metrics to the realtime backend that measure how often a single changed run is served to multiple subscriptions in one batch. ([#4341](#4341)) - Realtime run subscriptions can now be configured to read run data straight from the primary database, so a run's latest state is never served from a lagging replica. Off by default; replica reads are unchanged unless you turn it on. ([#4378](#4378)) - SSO and Directory Sync are no longer restricted to Enterprise plans — get in touch and we can turn them on for your organization whatever plan you're on. ([#4393](#4393)) - Improved supervisor observability: it now reports metrics for its outbound requests, making failed calls to upstream services easier to monitor. ([#4350](#4350)) - The runs list on a task's page now updates live — run statuses change and newly triggered runs appear without a manual refresh, matching the main Runs page. ([#4377](#4377)) - Speed up the Batches list page for environments with a large number of batches, which could previously time out while loading. ([#4361](#4361)) - Container startup no longer prints database and ClickHouse connection strings (with credentials) to the logs. ([#4346](#4346)) - The tasks page no longer runs two queries whose results were never displayed, cutting wasted work on every page load and removing a source of hidden server errors ([#4380](#4380)) <details> <summary>Raw changeset output</summary> # Releases ## @trigger.dev/build@4.5.8 ### Patch Changes - Updated dependencies: - `@trigger.dev/core@4.5.8` ## trigger.dev@4.5.8 ### Patch Changes - Updated dependencies: - `@trigger.dev/core@4.5.8` - `@trigger.dev/build@4.5.8` - `@trigger.dev/schema-to-json@4.5.8` ## @trigger.dev/core@4.5.8 ### Patch Changes - Allow additional environment API keys to create scoped public access tokens through the Trigger.dev API. Use server-issued public access tokens for batch operations so environment-scoped API keys can read batch results. ([#4387](#4387)) ## @trigger.dev/python@4.5.8 ### Patch Changes - Updated dependencies: - `@trigger.dev/sdk@4.5.8` - `@trigger.dev/core@4.5.8` - `@trigger.dev/build@4.5.8` ## @trigger.dev/react-hooks@4.5.8 ### Patch Changes - Updated dependencies: - `@trigger.dev/core@4.5.8` ## @trigger.dev/redis-worker@4.5.8 ### Patch Changes - Updated dependencies: - `@trigger.dev/core@4.5.8` ## @trigger.dev/rsc@4.5.8 ### Patch Changes - Updated dependencies: - `@trigger.dev/core@4.5.8` ## @trigger.dev/schema-to-json@4.5.8 ### Patch Changes - Updated dependencies: - `@trigger.dev/core@4.5.8` ## @trigger.dev/sdk@4.5.8 ### Patch Changes - Preserve the partial assistant message when a chat turn's model stream fails mid-response. `chat.agent` now passes the recovered partial to `onTurnComplete`, and `chat.createSession`'s `turn.complete()` keeps it before rethrowing, instead of dropping the streamed-so-far output. ([#4348](#4348)) - Allow additional environment API keys to create scoped public access tokens through the Trigger.dev API. Use server-issued public access tokens for batch operations so environment-scoped API keys can read batch results. ([#4387](#4387)) - Updated dependencies: - `@trigger.dev/core@4.5.8` </details> Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
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Summary
Adds two counters to the native realtime backend so we can see how much duplicate row serialization the change router does per batch. When a run changes it can match several held feeds at once (a run subscription plus one or more tag/list feeds), and today each matching feed serializes that run's wire value independently. These counters quantify that fan-out so we can decide whether a shared serialization step is worth it.
What they measure
realtime_native.emission_run_serializations: total wire-value serializations performed across feeds per batch (what the current path does).realtime_native.emission_distinct_serializations: distinct (columns, run) rows those serializations cover (what a serialize-once-per-batch step would do).Average feeds-per-run is
run_serializations / distinct_serializations, and1 - distinct / run_serializationsis the serialization work a shared step could save. Wired through a new optionalonEmissionFanoutcallback on the router. No behavior change.