Document difference between TLS Cert expiry metrics #1330
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
blackbox-exporter currently offers two metrics to
measure when TLS Certificates will expire.
The difference between those is very subtle, but
using
probe_ssl_earliest_cert_expiry
for checking whether a certificate is due to
replacement can lead to false positive alerts.
This documents the difference between those two.
Generally,
probe_ssl_last_chain_expiry_timestamp_seconds
seems to be what most people would want to use.