This functionality is in beta and is subject to change. The design and code is considered to be less mature than official GA features. Elastic will take a best effort approach to fix any issues, but beta features are not subject to the support SLA of official GA features.
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Elastic Docs ›Heartbeat Reference [6.3] ›Exported fields

TLS encryption layer fields

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TLS encryption layer fields

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None

tls fields

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TLS layer related fields.

rtt fields

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TLS layer round trip times.

handshake fields

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Time required to finish TLS handshake based on already available network connection.

tls.rtt.handshake.us

type: long

Duration in microseconds

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