Substantial overhead when logging Dynamic Metadata in Access Logging

[DuncanDoyle]

Gloo Edge Product

Enterprise

Gloo Edge Version

v1.16.6

Kubernetes Version

?

Describe the bug

We found that every DYNAMIC_METADATA log field penalty is ~10 microseconds in P50th and 20+ microseconds in P99th. The regular “key: value” log field penalty is ~1.7 microseconds in P50 and 3.3 in P99th.

The tests were done on the same cluster using k6 loadgen tool and nginx (openResty) simulated backend. The results were almost similar while set_metadata and extProc filters. It was found that the hard disk is not a bottleneck in this case.

As can be seen in the table, the gateway-proxy CPU is growing very much as a factor of dynamic metadata fields.

Expected Behavior

Logging dynamic metadata in accesslogging should not cause substantial processing overhead.

Steps to reproduce the bug

n.a

Additional Environment Detail

No response

Additional Context

No response