slog renders a bare time.Duration as an int64 nanosecond count and names
the unit nowhere, so every duration field in the fleet read like
"elapsed":135000000000. The repo idiom of .Round(time.Second) changed
the value without changing the shape and truncated every sub-second
measurement to zero.
otelsetup.Millis converts a duration for logging under a snake_case key
ending in _ms, and TestSlogDurationConvention type-checks ./spinifex/...
and ./cmd/... to fail the build when a raw Duration reaches an slog call
or a Millis value is logged under a key without the suffix. It found 55
sites across 34 files, well past the sites a grep for time.Since shows,
because most durations come from a config field or a package constant.
A handler-level ReplaceAttr would fix every site at once but can only
emit d.String(), which Elasticsearch maps as a keyword and nothing can
aggregate over.
Julian Sommer