Order of log entries not maintained

[johncurrier]

When we log multiple events during the same millisecond the order that they're logged isn't maintained when viewing those events in Splunk. Note that we're using a batch_size_count (which should be batchSizeCount, but that's a different issue) of 1 since we want to increase the chance that all events get persisted to Splunk.

logback.xml exhibiting the issue:

<configuration>
<appender name="splunk" class="com.splunk.logging.HttpEventCollectorLogbackAppender">
<url>${SPLUNK_URL}</url>
<token>${SPLUNK_TOKEN}</token>
<index>${SPLUNK_INDEX}</index>
<host>${SPLUNK_HOST}</host>
<connectTimeout>2000</connectTimeout>
<writeTimeout>1000</writeTimeout>
<batch_size_count>1</batch_size_count>
<includeMDC>false</includeMDC>
<includeThreadName>false</includeThreadName>

<layout class="ch.qos.logback.contrib.json.classic.JsonLayout">
<jsonFormatter class="ch.qos.logback.contrib.jackson.JacksonJsonFormatter">
<prettyPrint>false</prettyPrint>
</jsonFormatter>

<includeTimestamp>false</includeTimestamp>
<includeLevel>false</includeLevel>
<includeLoggerName>false</includeLoggerName>
<includeMDC>false</includeMDC>
<includeThreadName>false</includeThreadName>
<includeContextName>false</includeContextName>
</layout>
</appender>

<root level="info">
<appender-ref ref="splunk" />
</root>
</configuration>
`