The chain ends with an anchored certificate. The anchored certificate is not necessarily self-signed.
The certificate chain contains a revoked or otherwise explicitly distrusted certificate. The entire chain should be distrusted.
A full chain could not be loaded. The chain does not end with a self-signed certificate, a trusted anchor, or a pinned certificate.
The chain represents a pinned certificate. A pinned certificate is an exception which trusts a given certificate explicitly for a purpose and communication with a certain peer.
The chain ends with a self-signed certificate. No trust anchor was found.
The certificate chain's status is unknown. When a chain is not yet built it has this status. If a chain is modified after being built, it has this status.
The status of a built certificate chain. Will be set to Gcr.CertificateChainStatus.UNKNOWN for certificate chains that have not been built.