c9ba9062 replaced 5 bargauge panels with one table panel using a
joinByField+organize+sortBy transformations chain and a
vizConfig.group="table" viz spec. That construct had zero precedent
anywhere else in this repo's dashboards and its live render was
explicitly flagged as unverified at merge time (no in-container way
to render Grafana to confirm).
#4658 reports a dashboard crash: "'' not found in: reduce,
filterFieldsByName, ... transpose" - a Grafana transform-registry
lookup failing on an empty transformer id. That registry's full id
list matches the error text exactly, and the table panel is the only
panel in the whole swarm-grafana/dashboards tree using a non-empty
transformations array, so it's the leading suspect: some part of how
the dashboard-v2beta1 schema expects a QueryGroup's transformations
to be shaped likely differs from the classic {id, options} shape used
here, and the file-based provisioner may not be normalizing the
mismatch the same way a schema-v2-aware loader does.
Reverting to the prior, previously-uneventful bargauge panels
(byte-for-byte c9ba9062^'s version of this section) to stop the
active crash while the correct v2beta1 transformation shape gets
verified against a live Grafana render instead of guessed at again.
c9e12ffcc0