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The Tylon trunk
The board says what is in flight. The trunk says what actually landed, on which day, and it reads a month at a time.

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The line

HEAD → refs/heads/main at the top is what the line is: the branch this project promotes into, not an abstraction over it.
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A card that reached the last stage of its flow, on the day it got there.
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A card that is promised inside this window and has not gone out. One in the shot, still on the board in In development.
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Solid where the work is done, dashed where the month has not happened yet. The dash is not a forecast; it is the part of August that is still in front of the team.
The filled square is a release that closed. Wallets, first half, with the cards it carried listed under On the trunk beneath it.

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The five numbers

Each one is a sentence about the same window, and each says how it was counted — because a delivery metric nobody can reproduce is a delivery metric somebody will argue with. 28.6 days to land is the middle card, from the day it left Backlog to the day it landed. Read from 4 cards: the ones with no move out of the backlog have nothing to date them from, and are left out rather than counted as zero. 1 promotion refused is a move the provider would not take. 0 reverts opened is a revert pull request from a card that had already landed — the number that says whether what went out stayed out.
The arrows at the top right walk back through previous months, and the same window is available to a script at GET /v1/trunk.