Conditional operation on access log command operators

[seared1]

I am using the %CONNECTION_TERMINATION_DETAILS% access log command operator for holding a Message variable with connection termination details in json_format access log (like below).

When there is no termination happening, the value emitted by this is null in the logs. Instead of null can I have it emit an empty string? As I have logging requirements for values to be either empty strings or 0 for integers when the value is not available.

          access_log:
            - name: envoy.access_loggers.stdout
              typed_config:
                "@type": type.googleapis.com/envoy.extensions.access_loggers.stream.v3.StdoutAccessLog
                log_format:
                  json_format:
                    ApplicationProtocol: "%REQ(:SCHEME)%"
                    Message: "%CONNECTION_TERMINATION_DETAILS%"

Thanks!!

[Yan Avlasov]

You can file an Issue on GitHub and someone may have time to address your problem.

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[王杰]

use omity_empty_values, https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/core/v3/substitution_format_string.proto#envoy-v3-api-field-config-core-v3-substitutionformatstring-omit-empty-values