fix: use System.nanoTime() for cron check-in duration measurement#5611
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Thank you for the contribution. This looks great!
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LGTM, thank you for the help!
System.currentTimeMillis() is a wall-clock value and is subject to NTP adjustments and DST transitions. For long-running cron jobs this can produce incorrect or even negative durations in the check-in payload. Switch the start/end capture in CheckInUtils.withCheckIn() and the three SentryCheckInAdvice implementations (sentry-spring, sentry-spring-jakarta, sentry-spring-7) to System.nanoTime(), which is guaranteed monotonic. Use DateUtils.nanosToSeconds() (already present) to convert the delta. Fixes getsentry#5579
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Fixes #5579
Problem
Cron check-in durations were computed by subtracting two
System.currentTimeMillis()values. The wall clock is not monotonic — it is subject to NTP steps, leap-second smearing, and DST transitions. For long-running cron jobs this gives wide exposure to clock jumps, which can produce incorrect or negative duration values in the check-in payload.Fix
Switch the start/end capture to
System.nanoTime(), which is guaranteed monotonic and is the correct choice for measuring elapsed time.DateUtils.nanosToSeconds()(already present in the SDK) is used to convert the nanosecond delta to the seconds value expected bysetDuration().Changed files:
sentry/src/main/java/io/sentry/util/CheckInUtils.javasentry-spring/src/main/java/io/sentry/spring/checkin/SentryCheckInAdvice.javasentry-spring-jakarta/src/main/java/io/sentry/spring/jakarta/checkin/SentryCheckInAdvice.javasentry-spring-7/src/main/java/io/sentry/spring7/checkin/SentryCheckInAdvice.javaExisting duration tests (
assertNotNull(doneCheckIn.duration)) continue to pass unchanged; the delta of twonanoTime()calls is always non-negative and non-zero for any real workload