protected String formatTraceId(final String traceId) {
        if (traceId != null && traceId.length() == TRACE_ID_64_BIT_LENGTH) {
            return "0000000000000000" + traceId;
        }
        return traceId;
    }
Build google cloud appender.

@param name           the name
@param projectId      the project id
@param flattenMessage the flatten message
@param appenderRef    the appender ref
@param filter         the filter
@param config         the config
@return the google cloud appender
support/cas-server-support-gcp-logging/src/main/java/org/apereo/cas/logging/GoogleCloudAppender.java