swarm.serviceDomains is what gateway.lib.tlsFor consults to pick the
services leaf over the hive leaf. grafana, victoriametrics and otel each
claim a gateway name under the swarm apex but were absent from that list,
so their vhosts were served the HIVE certificate -- which cannot cover a
name under a different apex.
Invisible until a machine client hit it: a name mismatch is a
click-through warning in a browser and an outright refusal in an OTLP
exporter. The metrics UI and store looked healthy while the collector
failed every POST and dropped the samples.
tls: failed to verify certificate: x509: certificate is valid for
probe.example, *.probe.example, not otel.swarm.example
2dea5798e4