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diff --git a/sources/listing_schema.tex b/sources/listing_schema.tex
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+\begin{lstlisting}[caption=The Redis and PostgreSQL schema (\texttt{schema.proto} file)., label={lst:protobuf-schema}]
+syntax = "proto3";
+
+package proto;
+
+option java_package = "org.opendc.common";
+option java_outer_classname = "ProtobufMetrics";
+
+message ProtoExport {
+  string timestamp = 1;
+  string host_id = 2;
+  int32 tasksactive = 3;
+  double cpuutilization = 4;
+  double energyusage = 5;
+  double uptime = 6;
+  double downtime = 7;
+}\end{lstlisting}