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Lapses, i.e., number of times you've missed a card, versus how many days since you learned it:
(You expect some widening in lapses as cards get older, but here, some cards planted long ago have far higher lapse rates than peer cards of the same age. This tells me that I should reorganize my memory aid for these. Anki's leech system is an attempt to hint at the existence of such low-performing cards, but it's never engaged for the several cards.
Hovering over a point shows the card's facts that you'd selected to show. This plot is zoomable (mouse-scroll or trackpad-scroll) and pannable (drag), but do note that it gets slow with thousands of points.
Anki reviews are rated 1 for failure or 2--4 for passing (hard, medium, easy). This invites us to view the histogram of pass rates:
(I have a very curious bi-modal distribution, reminiscent of the slab-and-spike probability densities of compressive sensing. The histogram has about half its mass at 100% (50% of cards have never lapsed), and the rest of it is diffused over a bell curve between 80% and 96%.
This graph (also zoomable and pannable) can get busy: it shows when cards were planted as a line graph, with circles around each card's point. The circle's radius and opacity are tied to the number of lapses: large, transparent circles have no lapses; small, opaque circles have many lapses.
(This is a quick-and-dirty hard-to-analyze plot showing the relationship between two highly correlated variables: the number of lapses and the total number of reviews for each card:
(I like the blocks the jitter makes in the lower left, but the data's meaning is more apparent and less misleading in the first plot (card lapses versus card age)