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Add three Praefect metrics to docs

Brie Carranza requested to merge bcarranza-master-patch-66418 into master

What does this MR do?

This MR updates the docs to include information about three Gitaly metrics: gitaly_praefect_replication_latency_bucket, gitaly_praefect_replication_delay_bucket and gitaly_praefect_node_latency_bucket added in 12.10. While these three Gitaly metrics pertain to Praefect, eventually this table would contain information about Gitaly metrics (whether or not the involve Praefect).

This is in response to 🎫 201543 (available to GitLab team members with access to ZenDesk) and gitaly#3536 (closed).

The metrics and their associated MRs:

Metric Type Since Description Labels
gitaly_praefect_replication_latency_bucket Histogram 12.10 MR The amount of time it takes for replication to complete once the replication job has started.
gitaly_praefect_replication_delay_bucket Histogram 12.10 MR A measure of how much time passes between when the replication job is created and when it is started.
gitaly_praefect_node_latency_bucket Histogram 12.10 MR Latency in Gitaly returning health check information to Praefect, indicates Praefect connection saturation.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team

Support Team Contributions

Edited by Nick Gaskill

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