Export last replay age in replication collector #1085
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bitfehler
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Sticksman
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Nov 11, 2024
| rows := sqlmock.NewRows(columns). | ||
| AddRow(1000, 1) | ||
| AddRow(1000, 1, 3) |
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You should add an additional expected value below
The exported replication lag does not handle all failure modes, and can report 0 for replicas that are out of sync and incapable of recovery. A proper replacement for that metric would require a different approach (see e.g. prometheus-community#1007), but for a lot of folks, simply exporting the age of the last replay can provide a pretty strong signal for something being amiss. I think this solution might be preferable to prometheus-community#977, though the lag metric needs to be fixed or abandoned eventually. Signed-off-by: Conrad Hoffmann <ch@bitfehler.net>
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Sticksman
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this can fix issue for postgres 17. since replication lag doesn`t report |
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The exported replication lag does not handle all failure modes, and can report 0 for replicas that are out of sync and incapable of recovery.
A proper replacement for that metric would require a different approach (see e.g. #1007), but for a lot of folks, simply exporting the age of the last replay can provide a pretty strong signal for something being amiss.
I think this solution might be preferable to #977, though the lag metric needs to be fixed or abandoned eventually.