curl -v  -X GET "https://3scale-admin.3scale._domain_/admin/api/services/_service_id/metrics.xml?access_token=_access_token_"

<?xml version="1.0" encoding="UTF-8"?>
<metrics>
  <metric>
    <id>5467</id>
    <name>hits</name>
    <system_name>hits</system_name>
    <friendly_name>Hits</friendly_name>
    <service_id>627</service_id>
    <description>Number of API hits</description>
    <unit>hit</unit>
  </metric>
  <metric>
    <id>5468</id>
    <name>tbmetrics</name>
    <system_name>tbmetrics</system_name>
    <friendly_name>tbmetrics</friendly_name>
    <service_id>627</service_id>
    <description/>
    <unit>hit</unit>
  </metric>




  <method>
    <id>5471</id>
    <name>metodka</name>
    <system_name>metodka</system_name>
    <friendly_name>metodka</friendly_name>
    <service_id>627</service_id>
    <description/>
    <metric_id>5467</metric_id>
  </method>





  <metric>
    <id>5472</id>
    <name>custom</name>
    <system_name>custom</system_name>
    <friendly_name>custom</friendly_name>
    <service_id>627</service_id>
    <description/>
    <unit>hit</unit>
  </metric>
</metrics>