Duration counts are doubled

[matthewashley1]

Description

After upgrading Keycloak to version 26.1.4, I am observing keycloak_request_duration_count metrics being incorrectly reported. For every single request that is made to the Keycloak server, the duration count metrics are reported as 2 instead of 1. This is causing the duration count metrics to be inflated by a factor of 2 for all requests.

Expected Behavior

Duration count metrics are reported correctly

Environment

• OS version: Debian GNU/Linux 12 (bookworm)
• Keycloak version: 26.1.4
• Project version: 7.0.0

[amadeuheredia]

Same problem here with keycloak_response_errors_total metric, always add 2 to the Counter when an http error occurs.
Looks like the MetricsFilter is added twice in the filter chain, and the response is processed twice.