A hard maintenance window took DNS down on endpoints that already had a
working configuration: the bootstrap preflight read the maintenance answer
as a failed fetch and exited, turning a temporary API outage into an
endpoint outage.
Startup now falls back to the configuration on disk when a content- and
identity-bound marker records that the API produced it. Without one, ctrld
stops with API_MAINTENANCE (exit 37). Maintenance never self-uninstalls or
counts as a permanent rejection, a fallback run retries every 5-7 minutes
until a recovered configuration is applied, and deactivation is refused
with 503 while the PIN cannot be verified.
Master adaptation: pending-recovery and PIN-known handling live in
applyFetchedResolverConfig; logging uses *ctrld.Logger; the reload fetch
seam is fetchResolverConfigFn; the control-server and self-uninstall
probes use the existing fetchResolverConfig seam with loggerCtx.
Cuong Manh Le