This package has a flaky test FTBFS blocking testing migration.

https://ci.debian.net/packages/g/golang-github-prometheus-exporter-toolkit/testing/armhf/74276304/#L1994

195s === RUN   TestServerBehaviour/valid_tls_config_yml_and_tls_client_with_VerifyPeerCertificate_(present_invalid_SAN_DNS_entries)
195s time=2026-08-11T16:34:42.505Z level=INFO msg="Listening on" address=[::]:33011
195s time=2026-08-11T16:34:42.508Z level=INFO msg="TLS is enabled." http2=true address=[::]:33011
195s 2026/08/11 16:34:42 http: TLS handshake error from [::1]:50182: could not find allowed SANs in client cert, found: [bad]
195s     tls_config_test.go:570: Expected error matching regular expression: bad certificate
195s     tls_config_test.go:571: Got: Get "https://localhost:33011": write tcp [::1]:50182->[::1]:33011: write: connection reset by peer
195s === RUN   TestServerBehaviour/valid_rate_limiter_(no_rate_limiter_set_up)_that_doesn't_block
...
195s     --- PASS: TestServerBehaviour/valid_tls_config_yml_and_tls_client_with_VerifyPeerCertificate_(present_good_SAN_DNS_entry) (0.39s)
195s     --- FAIL: TestServerBehaviour/valid_tls_config_yml_and_tls_client_with_VerifyPeerCertificate_(present_invalid_SAN_DNS_entries) (0.35s)
195s     --- PASS: TestServerBehaviour/valid_rate_limiter_(no_rate_limiter_set_up)_that_doesn't_block (0.25s)
...

/Simon