What mutual TLS (mTLS) is, how two-way certificate authentication differs from regular TLS, and how to monitor client certs so they don't cause outages.
How HTTP/3 and QUIC change monitoring: UDP 443, 0-RTT, connection migration, fallback to HTTP/2, and the new failure modes and metrics you must watch.
Monitor TLS versions, ciphers, certificate chains, SANs, OCSP stapling, CT logs, and HSTS without treating expiry as the only failure mode.
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