feat(promslog): implement reserved keys, rename duplicates #746
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This commit adds support for "reserved" keys, where upon detecting a duplicate log attribute key, it will rename the key to prevent collisions/issues with core slog attribute keys in use. The reserved keys are: - `level` - `source` (for standard slog style) - `caller` (for legacy go-kit style) - `time` (for standard slog style) - `ts` (for legacy go-kit style) By supporting reserved keys, we allow users of the library to use these keys for their own supplemental log attributes. Fixes: prometheus#745 Example test output: ``` === RUN TestReservedKeys/slog_log_style time=2025-01-13T18:32:46.508Z level=INFO source=slog_test.go:212 msg="reserved keys test for slog_log_style" logged_level="surprise! I'm a string" logged_source="surprise! I'm a string" logged_time="surprise! I'm a string" === RUN TestReservedKeys/go-kit_log_style ts=2025-01-13T18:32:46.508Z level=info caller=slog_test.go:212 msg="reserved keys test for go-kit_log_style" logged_level="surprise! I'm a string" logged_caller="surprise! I'm a string" logged_ts="surprise! I'm a string" ``` Note: this implementation only technically removes duplicates of our core reserved keys. If a user adds multiple instances of a reserved key, the rest get renamed to `logged_$key`, which means there could be duplicate attributes with `logged_$key`. This is mostly to simplify implementation so we don't need to bother reference counting in the replace attr function to do things like `logged_$key1`, `logged_$key2`, etc. Signed-off-by: TJ Hoplock <[email protected]>
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Huh, I didn't get a lint error locally. Looking |
Signed-off-by: TJ Hoplock <[email protected]>
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This commit adds support for "reserved" keys, where upon detecting a
duplicate log attribute key, it will rename the key to prevent
collisions/issues with core slog attribute keys in use.
The reserved keys are:
levelsource(for standard slog style)caller(for legacy go-kit style)time(for standard slog style)ts(for legacy go-kit style)By supporting reserved keys, we allow users of the library to use these
keys for their own supplemental log attributes.
Fixes: #745
Example test output:
Note: this implementation only technically removes duplicates of our
core reserved keys. If a user adds multiple instances of a reserved key,
the rest get renamed to
logged_$key, which means there could beduplicate attributes with
logged_$key. This is mostly to simplifyimplementation so we don't need to bother reference counting in the
replace attr function to do things like
logged_$key1,logged_$key2,etc.
Signed-off-by: TJ Hoplock [email protected]