fix(dashboards): Remove references to removed datasets

[mjq]

discover and transactions are no longer valid datasets for dashboard widgets (the same use cases are supported by errors and spans). All existing dashboards have been migrated off of those datasets and creating new widgets that use them has been blocked on all billing plans.

Remove all references to discover and transactions datasets from dashboard code and skills. Also removes transaction-specific aggregate functions from DISCOVER_AGGREGATE_FUNCTIONS (now ERROR_AGGREGATE_FUNCTIONS, as that is the only dataset left that supports them).

See BROWSE-682.

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Project	Deployment	Actions	Updated (UTC)
cli	Ready	Preview	Aug 31, 2026 4:17pm

[BYK]

I think you should merge this one with your other PR

[linear-code]

BROWSE-682

[BYK]

Jared, take over the PR, address all bot comments, address all review comments and get it merged

[jared-outpost]

taking this over. current state of #1515:

• approved (BYK), all checks green, no unresolved review threads
• no outstanding bot or review comments that need code changes — the only note is your approval saying to merge this one together with fix(alerts): Remove deprecated transactions dataset #1516

the code here is complete. the one thing i can't resolve on my own: #1516 (the alerts half of BROWSE-682) is still a draft with an open design thread — route transaction(s) → spans with is_transaction:true plus a gentle nudge — and that routing isn't implemented yet. since these files don't overlap, merging is safe either way; the question is timing.

how do you want #1515 handled?

1. merge it now independently (it's ready), or
2. hold it and land both together once fix(alerts): Remove deprecated transactions dataset #1516's routing + nudge work is done (i'll pick that up under fix(alerts): Remove deprecated transactions dataset #1516's take-over).

happy to merge immediately on a 👍 — just don't want to break the "merge these together" intent by shipping #1515 while #1516 is still in draft.