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8418d474a7
The span reverse-coverage check has never evaluated. It reported "no span
names were reported (backend unreachable or empty)" on a run where Tempo
demonstrably held data -- the same run resolved a logged trace id to 32
spans.
Root cause: the tag-values query asked for `span.name`. A span's name is a
TraceQL intrinsic, not a span-scoped attribute, so `span.name` resolves to
an attribute nothing sets. Tempo answers 200 with an empty tagValues list,
which is indistinguishable from an empty backend and never raises, so the
surrounding try/except stayed silent.
Verified against tempo 2.9.4 holding exactly one span named
probe.reverse.coverage, with the collector in front of it:
/api/v2/search/tag/span.name/values -> {"tagValues":[]}
/api/v2/search/tag/name/values -> that span's name
/api/v2/search/tag/resource.service.name/values -> xrpld
The third line is the control: the span was in Tempo, so the first line's
emptiness was the wrong tag rather than no data. Cross-checked against a
populated Tempo elsewhere, whose span scope lists real attributes
(command, ledger_seq, tx_hash) and no name tag at all, while the bare
intrinsic returns the whole span inventory.
This is pre-existing, not a regression in the reverse check: the same URL
fed the operations diagnostic before that check existed, and the last
green run before it also logged "Tempo operations (0 total)". The check
faithfully reported an empty input; the input was broken.
The neighbouring resource.service.name query is correctly scoped and is
left alone.