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Ashwin Bhatkal a6ac14344e fix(dashboard): count panel stats from the v2 spec (#12396)
* fix(dashboard): count panel stats from the v2 spec

The panel counters walked a top-level `widgets` array and returned early
when the key was missing. A v2 dashboard stores only `metadata` and
`spec`, with panels as a map under `spec.panels`, so every v2 row hit
that early return and all `dashboard.panels.*` stats stayed at zero.
`dashboard.count` was unaffected — it is a row count.

Read the v2 spec instead: count the panels under `spec.panels` and take
each panel's signal from its query envelope, reusing the typed read path
and `QueryEnvelope.GetSignal`. Signal-less queries (promql, clickhouse
sql, formulas) count towards the panel total only. v1 rows are no longer
parsed for panel stats and contribute to `dashboard.count` alone.

* test(dashboard): drop the constant name arg from the stats query helper

statsBuilderQuery only ever received "A", which go-lint flags via unparam.
A panel holds a single query, so the name never mattered to the assertions;
the composite test still names its sub-queries through statsBuilderQuerySpec.

* refactor(dashboard): move v2 panel stats to a perses_ file

All v2 code lives in perses_-prefixed files until the v1 code goes away.
Pure move of the stats block out of dashboard.go, tests alongside it.

* fix(dashboard): count create-v2 stats off the postable spec

CreateV2 already holds the postable dashboard, so decoding the storable
back into a v2 dashboard just to count its panels was a needless type
conversion on the create path.

Split the panel walk into addPanelStats over a DashboardSpec, and add
NewStatsFromPostableDashboardV2 for the create path. The storable variant
keeps its signature for the periodic collectors, which only have rows.
2026-08-05 04:16:02 +00:00
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