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Highlights

To localize such an issue, investigate whether the change is systemic across all dimensions or specific to some dimensions. (View Highlight)

Examine other correlated metrics for similar changes. For example, if number of sessions is correlated with DAU, and you see a change in DAU but not number of sessions, a logging bug may be the problem. (View Highlight)

Note mix shift may be a strong factor in long-term changes, but likely will not be the source of changes week over week. (View Highlight)