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* promql: add test for info() with data label matcher when info series goes stale
When info() is called with a data label matcher that doesn't match
the empty string (e.g. {data=~".+"}), samples at timestamps where
no info series is available should be dropped rather than falling
back to the original un-enriched series.
This case was missing from the test suite.
* docs: document info() behavior when info series is unavailable
Document that when no matching info series exists at a timestamp,
data label matchers that don't match the empty string cause the
sample to be dropped, while empty-matching matchers or no selector
return the series unenriched.
* promql: add test cases for info() fallback when info series goes stale
Add test cases for info(metric, {data=~".*"}) and info(metric) to
complement the existing info(metric, {data=~".+"}) test case, making
the behavioral contrast explicit: empty-matching matchers and no
selector fall back to the unenriched series, while non-empty-matching
matchers drop the sample.
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Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>