Add metric tracking the time spent inside gateway

[paskos]

Is your feature request related to a problem? Please describe. No. Feature is not related to a problem

Describe the solution you'd like In the same vain as spring.cloud.gateway.requests it would be useful to have a metric like spring.cloud.gateway.internal.latency (example, not necessarily real name) tracking the time spend inside the gateway. It would have the same kind of tags as spring.cloud.gateway.requests to be able to monitor the latency based on criterion. Ex: For a 100 ms round trip spring.cloud.gateway.requests , spring.cloud.gateway.requests would report 3ms. Meaning that gateway counted for 3% of the total time. We do not have the capability to determine gateway latency and therefore cannot measure the impact of changes or improvements in our security or caching inside the gateway.

Describe alternatives you've considered We considered developing our own metric collection inside that gateway but we're not familiar (tbh competent would be a better word).

Additional context Versions

• spring-cloud-gateway: 3.1.0
• java 11

[tbadalov]

Any updates on this? Looking for the same metric

[spencergibb]

No one is working on it. When you see it assigned to a Project and Milestone, then we have it prioritized for work. PRs welcome.