Update PyTorch Inference toolkit to log telemetry metrics (#131)

* Update PyTorch Inference toolkit to log telemetry metrics

* Remove changes in torchserve.py

Author: sachanub

src/sagemaker_pytorch_serving_container/etc/log4j2.xml

@@ -59,6 +59,17 @@
             </Policies>
             <DefaultRolloverStrategy max="5"/>
         </RollingFile>
+        <ScriptAppenderSelector name="telemetry_metrics">
+				<Script language="JavaScript"><![CDATA[
+				java.lang.System.getenv("SM_TELEMETRY_LOG") == null ? "null_appender" : "remote_appender";]]>
+		</Script>
+		<AppenderSet>
+				<Null name="null_appender"/>
+		<File name="remote_appender" fileName="${env:SM_TELEMETRY_LOG}">
+				<PatternLayout pattern="%m%n"/>
+		</File>
+		</AppenderSet>
+		</ScriptAppenderSelector>
     </Appenders>
     <Loggers>
         <Logger name="ACCESS_LOG" level="info">
@@ -78,10 +89,12 @@
         <Logger name="TS_METRICS" level="info">
             <AppenderRef ref="ts_metrics"/>
         </Logger>
+        <Logger name="TELEMETRY_METRICS" level="all">
+            <AppenderRef ref="telemetry_metrics"/>
+		</Logger>
         <Root level="info">
             <AppenderRef ref="STDOUT"/>
             <AppenderRef ref="ts_log"/>
         </Root>
     </Loggers>
 </Configuration>
-