promslog: Use the default timezone (again) #739
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SuperQ
requested changes
Dec 5, 2024
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It's a feature, not a bug… :) But even if we come to the conclusion in the end that it is a bug fix, let's first come to that conclusion before we start cutting actual releases with the changed log format. |
SuperQ
approved these changes
Mar 31, 2025
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I guess we need to do a bit of a rebase revert. |
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Yeah, other things happened with fine tuning the timestamp format. I'll push a new commit shortly. |
As per the dev-summit discussion, we want to use the default timezone as selected by slog after all rather than a hardcoded UTC. (This was accidentally introduced earlier when moving from gokit to slog, but then switched back to hardcoded UTC in PR #735.) Environments that have configured UTC anyway won't see any difference, but those with other timezones configured will see the configured timezone for the timestamps in their logs. This is in line with how slog behaves by default. Example timestamp _before_ this change and also _after_ this change with UTC configured in the environment via a suitable way (e.g. setting `TZ=UTC` on Linux): time=2025-04-10T12:00:38.179Z Example timestamp _after_ this change with location Europe/Berlin, i.e. timezone is CET or CEST: time=2025-04-10T14:00:03.120+02:00 Note that the precise delta to UTC is in the timestamp. So this change will also be transparent to the usual logs processing tools. Signed-off-by: beorn7 <[email protected]>
beorn7
changed the title
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Here we are. @SuperQ PHAL. |
SuperQ
approved these changes
Apr 10, 2025
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This reverts commit 145b50a.
See discussion on Slack. We should first decide which log format we want before changing it from what is already released in prometheus/prometheus.
UPDATE:
This is the new commit description:
As per the dev-summit discussion, we want to use the default timezone
as selected by slog after all rather than a hardcoded UTC.
(This was accidentally introduced earlier when moving from gokit to
slog, but then switched back to hardcoded UTC in PR #735.)
Environments that have configured UTC anyway won't see any difference,
but those with other timezones configured will see the configured
timezone for the timestamps in their logs. This is in line with how
slog behaves by default.
Example timestamp before this change and also after this change
with UTC configured in the environment via a suitable way (e.g.
setting
TZ=UTCon Linux):Example timestamp after this change with location Europe/Berlin,
i.e. timezone is CET or CEST:
Note that the precise delta to UTC is in the timestamp. So this change
will also be transparent to the usual logs processing tools.