Anonymous usage statistics.
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"Undefined" counts visitors that don't identify which service they used: older app builds from before per-service tracking, and direct connections.
A visitor who uses several services is counted once per service; the total counts each visitor once, so rows don't sum to it.
How these stats stay anonymous: no IP addresses are stored and no cookies are used. Each visitor's network address is hashed with HMAC-SHA256 using a random key that never leaves the server, so we can count distinct visitors without any way to recover who they were.