fix(replay): Fix timestamps on LCP #7225
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`value` was being used as ms but start/end timestamps are in seconds. Changed start and end to be equal because LCP does not have a duration, it is a single point in time.
billyvg
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Feb 18, 2023
Changes LCP breadcrumb rendering to use `data.value` instead of trying to calculate the value (which ends up resulting in incorrect values as it uses the replay start timestamp, so LCP from a refresh will be wrong). Related getsentry/sentry-javascript#7225
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Lms24
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Feb 20, 2023
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LGTM
LGTM - we should def. add some integration tests checking the actual captured values from the browser there
Sure, it's probably simplest to adjust the custom events integration test to check that the LCP entry has equal start and end times. Will open a quick PR
EDIT: #7229
billyvg
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Feb 28, 2023
Changes LCP breadcrumb rendering to use `data.value` instead of trying to calculate the value (which ends up resulting in incorrect values as it uses the replay start timestamp, so LCP from a refresh will be wrong). Related getsentry/sentry-javascript#7225 Note that the above PR changes start + end timestamps to be equal since LCP is a single point in time rather than a range. The above PR also corrects the timestamp to be when the LCP occurs (rather than the previous start timestamp which is wrong and generally ends up around page load time). Adds a warning for old SDK versions: 
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valuewas being used as ms but start/end timestamps are in seconds. Changed start and end to be equal because LCP does not have a duration, it is a single point in time. This also corrects the timestamp to be when the LCP occurs (rather than the previous start timestamp which is wrong and generally ends up around page load time).