feat(log): allow ISO 8601 with millisecond precision as timestamp format
Resolves #9 (closed).
So far we've been using RFC3339 (logrus default) with no millisecond precision.
This MR adds support for ISO 8601 timestamps as an opt-in feature by setting the GITLAB_ISO8601_LOG_TIMESTAMP
environment variable. RFC3339 remains as default for backward
compatibility reasons.
Edited by João Pereira