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Dead stub — redirects to /api/ (v23). Documented here for historical reference only.
/api (unversioned) currently aliases v23, the latest version — it is not v19 or v20.
v21 and v22 are also live (at /api/v21 and /api/v22) but frozen; the endpoint reference here
matches v23, and v20's request/response shapes (flat overage_items OSD, no route-closure gating) still apply to v20.
v19 has no real implementation left — every request other than /api/v19/version 301-redirects to /api.