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                                                    <td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0"> <p style="margin: 10px 0 0 0; margin-top: 0">I ended up creating my own JsonProvider. See below (code in kotlin):</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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                                                                <pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.access.spi.IAccessEvent
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.classic.util.LogbackMDCAdapter
<span class="code-keyword" style="color: #000091">import</span> com.fasterxml.jackson.core.JsonGenerator
<span class="code-keyword" style="color: #000091">import</span> net.logstash.logback.composite.AbstractFieldJsonProvider
<span class="code-keyword" style="color: #000091">import</span> net.logstash.logback.composite.FieldNamesAware
<span class="code-keyword" style="color: #000091">import</span> net.logstash.logback.composite.JsonWritingUtils
<span class="code-keyword" style="color: #000091">import</span> net.logstash.logback.fieldnames.LogstashAccessFieldNames
<span class="code-keyword" style="color: #000091">import</span> org.slf4j.MDC
<span class="code-keyword" style="color: #000091">import</span> java.io.IOException
<span class="code-keyword" style="color: #000091">import</span> java.util.*

class AccessMdcProvider : AbstractFieldJsonProvider<IAccessEvent>(), FieldNamesAware<LogstashAccessFieldNames> {
    <span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">var</span> includeMdcKeyNames: MutableList<<span class="code-object" style="color: #910091">String</span>> = ArrayList()
    <span class="code-keyword" style="color: #000091">private</span> <span class="code-keyword" style="color: #000091">var</span> excludeMdcKeyNames: MutableList<<span class="code-object" style="color: #910091">String</span>> = ArrayList()

    override fun start() {
        <span class="code-keyword" style="color: #000091">if</span> (!<span class="code-keyword" style="color: #000091">this</span>.includeMdcKeyNames.isEmpty() && !<span class="code-keyword" style="color: #000091">this</span>.excludeMdcKeyNames.isEmpty()) {
            addError(<span class="code-quote" style="color: #009100">"Both includeMdcKeyNames and excludeMdcKeyNames are not empty.  Only one is allowed to be not empty."</span>)
        }
        <span class="code-keyword" style="color: #000091">super</span>.start()
    }

    @Throws(IOException::class)
    override fun writeTo(generator: JsonGenerator, event: IAccessEvent) {
        val mdcProperties = getMDCPropertyMap().takeIf { it.isNotEmpty() }?.let { props ->
            <span class="code-keyword" style="color: #000091">if</span> (!includeMdcKeyNames.isEmpty()) {
                props.toMutableMap().also { it.keys.retainAll(includeMdcKeyNames) }
            } <span class="code-keyword" style="color: #000091">else</span> <span class="code-keyword" style="color: #000091">if</span> (!excludeMdcKeyNames.isEmpty()) {
                props.toMutableMap().also { it.keys.removeAll(excludeMdcKeyNames) }
            } <span class="code-keyword" style="color: #000091">else</span>
                props
        }

        mdcProperties?.also {
            <span class="code-keyword" style="color: #000091">if</span> (fieldName != <span class="code-keyword" style="color: #000091">null</span>) {
                generator.writeObjectFieldStart(fieldName)
            }
            JsonWritingUtils.writeMapEntries(generator, it)
            <span class="code-keyword" style="color: #000091">if</span> (fieldName != <span class="code-keyword" style="color: #000091">null</span>) {
                generator.writeEndObject()
            }
        }
    }

    <span class="code-keyword" style="color: #000091">private</span> fun getMDCPropertyMap(): Map<<span class="code-object" style="color: #910091">String</span>, <span class="code-object" style="color: #910091">String</span>> {
        <span class="code-comment" style="color: #808080">// populate mdcPropertyMap <span class="code-keyword" style="color: #000091; color: #808080">if</span> <span class="code-keyword" style="color: #000091; color: #808080">null</span>
</span>        val mdcPropertyMap = MDC.getMDCAdapter().let { mdc->
            <span class="code-keyword" style="color: #000091">if</span> (mdc is LogbackMDCAdapter)
                mdc.propertyMap
            <span class="code-keyword" style="color: #000091">else</span>
                mdc.copyOfContextMap
        } ?: emptyMap<<span class="code-object" style="color: #910091">String</span>, <span class="code-object" style="color: #910091">String</span>>()
        <span class="code-keyword" style="color: #000091">return</span> mdcPropertyMap
    }

    override fun setFieldNames(fieldNames: LogstashAccessFieldNames) {
        <span class="code-comment" style="color: #808080">//fieldName = fieldNames.mdc
</span>    }

    fun getIncludeMdcKeyNames(): List<<span class="code-object" style="color: #910091">String</span>> {
        <span class="code-keyword" style="color: #000091">return</span> Collections.unmodifiableList(includeMdcKeyNames)
    }

    fun addIncludeMdcKeyName(includedMdcKeyName: <span class="code-object" style="color: #910091">String</span>) {
        <span class="code-keyword" style="color: #000091">this</span>.includeMdcKeyNames.add(includedMdcKeyName)
    }

    fun setIncludeMdcKeyNames(includeMdcKeyNames: List<<span class="code-object" style="color: #910091">String</span>>) {
        <span class="code-keyword" style="color: #000091">this</span>.includeMdcKeyNames = ArrayList(includeMdcKeyNames)
    }

    fun getExcludeMdcKeyNames(): List<<span class="code-object" style="color: #910091">String</span>> {
        <span class="code-keyword" style="color: #000091">return</span> Collections.unmodifiableList(excludeMdcKeyNames)
    }

    fun addExcludeMdcKeyName(excludedMdcKeyName: <span class="code-object" style="color: #910091">String</span>) {
        <span class="code-keyword" style="color: #000091">this</span>.excludeMdcKeyNames.add(excludedMdcKeyName)
    }

    fun setExcludeMdcKeyNames(excludeMdcKeyNames: List<<span class="code-object" style="color: #910091">String</span>>) {
        <span class="code-keyword" style="color: #000091">this</span>.excludeMdcKeyNames = ArrayList(excludeMdcKeyNames)
    }
}
</pre> 
                                                            </div>
                                                        </div> <p style="margin: 10px 0 0 0">, and attached it to my CompositeJsonEncoder:</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
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                                                                <pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">import</span> ch.qos.logback.access.spi.IAccessEvent
<span class="code-keyword" style="color: #000091">import</span> net.logstash.logback.LogstashAccessFormatter
<span class="code-keyword" style="color: #000091">import</span> net.logstash.logback.composite.CompositeJsonFormatter
<span class="code-keyword" style="color: #000091">import</span> net.logstash.logback.encoder.CompositeJsonEncoder

class AccessEncoder : CompositeJsonEncoder<IAccessEvent>() {
    override fun createFormatter(): CompositeJsonFormatter<IAccessEvent> =
            LogstashAccessFormatter(<span class="code-keyword" style="color: #000091">this</span>).also {
                it.providers.addProvider(AccessMdcProvider())
            }
}
</pre> 
                                                            </div>
                                                        </div> <p style="margin: 10px 0 0 0">, and used it in logback.xml:</p> 
                                                        <div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px 3px 3px 3px; border-radius: 3px 3px 3px 3px; margin: 9px 0">
                                                            <div class="codeContent panelContent" style="padding: 9px 12px"> 
                                                                <pre class="code-java" style="margin: 10px 0 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<configuration>
    <appender name=<span class="code-quote" style="color: #009100">"ACCESS_FILE"</span> class=<span class="code-quote" style="color: #009100">"ch.qos.logback.core.rolling.RollingFileAppender"</span>>
        ...
        <encoder class=<span class="code-quote" style="color: #009100">"mynamespace.AccessEncoder"</span>/>
    </appender>
</pre> 
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