Divide By Zero Exception

[DanielALS]

I've recently added a new policy and found logs full of divide by zero errors. I think this is happening during ETL.
The policy is designed to be a sparse monitor of channels that may flap and we only want to capture the first two.

Policy:

mon_sparse_shorttermstore_plugin_url = 'pb://localhost?name=STS&rootFolder=&partitionGranularity=PARTITION_5MIN&hold=288&gather=12&consolidateOnShutdown=true' mon_sparse_mediumtermstore_plugin_url = 'pb://localhost?name=MTS&rootFolder=&partitionGranularity=PARTITION_HOUR&hold=168&gather=2' mon_sparse_longtermstore_plugin_url = 'pb://localhost?name=LTS&rootFolder=&partitionGranularity=PARTITION_MONTH'

Error from the log:

021-05-03 10:17:14 ERROR org.epics.archiverappliance.retrieval.DataRetrievalServlet - Exception when retrieving data -->java.lang.ArithmeticException: / by zero java.lang.ArithmeticException: / by zero at org.epics.archiverappliance.retrieval.postprocessors.SummaryStatsPostProcessor.estimateMemoryConsumption(SummaryStatsPostProcessor.java:127) at org.epics.archiverappliance.retrieval.postprocessors.Optimized.estimateMemoryConsumption(Optimized.java:109) at org.epics.archiverappliance.retrieval.DataRetrievalServlet.determineExecutorForPostProcessing(DataRetrievalServlet.java:1355) at org.epics.archiverappliance.retrieval.DataRetrievalServlet.doGetSinglePV(DataRetrievalServlet.java:423) at org.epics.archiverappliance.retrieval.DataRetrievalServlet.doGet(DataRetrievalServlet.java:141) at javax.servlet.http.HttpServlet.service(HttpServlet.java:626) at javax.servlet.http.HttpServlet.service(HttpServlet.java:733) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:373) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1589) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.base/java.lang.Thread.run(Thread.java:834)