package envoy.extensions.access_loggers.filters.cel.v3

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ExpressionFilter is an access logging filter that evaluates configured symbolic Common Expression Language expressions to inform the decision to generate an access log.

• string expression = 1

  Expression that, when evaluated, will be used to filter access logs. Expressions are based on the set of Envoy :ref:`attributes <arch_overview_attributes>`. The provided expression must evaluate to true for logging (expression errors are considered false). Examples: * ``response.code >= 400`` * ``(connection.mtls && request.headers['x-log-mtls'] == 'true') || request.url_path.contains('v1beta3')``