Logback Appender and message size

Hi all,

we are using HttpEventCollectorLogbackAppender in raw mode and it looks like sent messages are somehow cut at a bit less than 10240 bytes.
Checking source code I see there is a limit in batchSize (coincidential?) at 10240 and I cannot override it as we are in raw mode[1]: is there any tip around this issue? Sometime we need to send large-ish json payload in the message and we are losing informations.
This is our logback.xml configuration:

			<appender name="SPLUNK_APPENDER"
				class="com.splunk.logging.HttpEventCollectorLogbackAppender">
				<url>${SPLUNK_URL}</url>
				<token>${SPLUNK_TOKEN}</token>
				<index>${SPLUNK_INDEX}</index>
				<!-- disableCertificateValidation should be true as we do not use valid certificates -->
				<disableCertificateValidation>true</disableCertificateValidation>
				
				<source>${SOURCE}</source>
				<sourcetype>logback</sourcetype>
				<messageFormat>text</messageFormat>
				<type>raw</type>
				<layout class="ch.qos.logback.classic.PatternLayout">
					<pattern>%d{yyyy-MM-dd'T'HH:mm:ss.SSSXXX, UTC} %.-3level SPAN_ID=%X{span_id} TRACE_ID=%X{trace_id} callId=%X{CALL_ID} uID=%X{USER_ID} ST=%X{SESSION_TOKEN} CH=%X{CHANNEL} %logger{35} - %msg%n%xException</pattern>
				</layout>
			</appender>

Thanks in advance for any help

[1]https://github.com/splunk/splunk-library-javalogging/blob/cf59a50d63ef495398f30a8f59b96b5bb62962d5/src/main/java/com/splunk/logging/HttpEventCollectorLogbackAppender.java#L251

Start with src/main/java/com/splunk/logging/HttpEventCollectorLogbackAppender.java at the batchSize limit referenced in the issue, then trace how raw mode handles the configured Logback message. Reproduce the behavior with the supplied logback.xml and a JSON payload larger than 10240 bytes. Done means the supported behavior for large raw messages is clear and the payload is no longer unexpectedly truncated, or an explicit workaround is documented.