something like this if i understood correctly
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
<xsl:output indent="yes"/>
<xsl:key name="id" match="service" use="id"/>
<xsl:template match="/">
<xsl:for-each
select="/x/session/service[generate-id()=generate-id(key('id',id))]">
<service>
<xsl:copy-of select="name|id"/>
<xsl:for-each select="key('id',id)/../metric">
<xsl:sort select="@name"/>
<xsl:copy-of select="."/>
</xsl:for-each>
</service>
</xsl:for-each>
</xsl:template>
</xsl:stylesheet>
$ saxon session.xml session.xsl
<?xml version="1.0" encoding="utf-8"?>
<service>
<name>somename</name>
<id>1</id>
<metric name="andanothermetric">value3</metric>
<metric name="andanothermetric">value6</metric>
<metric name="anothermetric">value2</metric>
<metric name="anothermetric">value5</metric>
<metric name="somemetric">value1</metric>
<metric name="somemetric">value4</metric>
</service>
<service>
<name>anothername</name>
<id>2</id>
<metric name="andanothermetric">value9</metric>
<metric name="andanothermetric">value12</metric>
<metric name="anothermetric">value8</metric>
<metric name="anothermetric">value11</metric>
<metric name="somemetric">value7</metric>
<metric name="somemetric">value10</metric>
</service>
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