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diff --git a/src/mongo/db/free_mon/free_mon_protocol.idl b/src/mongo/db/free_mon/free_mon_protocol.idl
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@@ -0,0 +1,149 @@
+# Copyright (C) 2018-present MongoDB, Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the Server Side Public License, version 1,
+# as published by MongoDB, Inc.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# Server Side Public License for more details.
+#
+# You should have received a copy of the Server Side Public License
+# along with this program. If not, see
+# <http://www.mongodb.com/licensing/server-side-public-license>.
+#
+# As a special exception, the copyright holders give permission to link the
+# code of portions of this program with the OpenSSL library under certain
+# conditions as described in each individual source file and distribute
+# linked combinations including the program with the OpenSSL library. You
+# must comply with the Server Side Public License in all respects for
+# all of the code used other than as permitted herein. If you modify file(s)
+# with this exception, you may extend this exception to your version of the
+# file(s), but you are not obligated to do so. If you do not wish to do so,
+# delete this exception statement from your version. If you delete this
+# exception statement from all source files in the program, then also delete
+# it in the license file.
+#
+global:
+    cpp_namespace: "mongo"
+
+imports:
+    - "mongo/idl/basic_types.idl"
+
+
+enums:
+    MetricsEncoding:
+        description: "Metrics Encoding Methods"
+        type: string
+        values:
+            snappy: "snappy"
+
+
+structs:
+    FreeMonRegistrationRequest:
+        description: "Registration Request to Cloud Server"
+        fields:
+          version:
+            description: "Protocol version, initial version is 1"
+            type: long
+          payload:
+            description: "Payload of registration information"
+            type: object
+          id:
+            description: "Existing Registration Id"
+            type: string
+            optional: true
+          localTime:
+            description: "Local time at registration send"
+            type: date
+          tags:
+            description: "Tags"
+            type: array<string>
+            optional: true
+
+    FreeMonRegistrationResponse:
+        description: "Registration Response from Cloud Server"
+        fields:
+          version:
+            description: "Protocol version, initial version is 1"
+            type: long
+          haltMetricsUploading:
+            description: "True indicates it should not proceed to metrics uploading"
+            type: bool
+          id:
+            description: "Existing Registration Id"
+            type: string
+          informationalURL:
+            description: "Informational HTTP web page for metrics"
+            type: string
+          message:
+            description: "Informational message for shell to display to user"
+            type: string
+          reportingInterval:
+            description: "Metrics Reporting interval in seconds"
+            type: long
+          userReminder:
+            description: "Informational message to display to user to remind them about the service"
+            type: string
+            optional: true
+
+
+    FreeMonMetricsRequest:
+        description: "Metrics Request to Cloud Server"
+        fields:
+          version:
+            description: "Protocol version, initial version is 1"
+            type: long
+          id:
+            description: "Registration Id"
+            type: string
+          localTime:
+            description: "Local time at metrics send"
+            type: date
+          encoding:
+            description: "Compression Encoding"
+            type: MetricsEncoding
+          metrics:
+            description: "Metrics Blob"
+            type: bindata_generic
+
+    # History
+    # -------
+    # Version 2 - added resendRegistration bool
+    #
+    FreeMonMetricsResponse:
+        description: "Metrics Response from Cloud Server"
+        fields:
+          version:
+            description: "Protocol version, initial version is 1"
+            type: long
+          haltMetricsUploading:
+            description: "True indicates it should not proceed to metrics uploading"
+            type: bool
+          permanentlyDelete:
+            description: "True indicates it permanently delete the local state"
+            type: bool
+          reportingInterval:
+            description: "Metrics Reporting interval in seconds"
+            type: long
+          id:
+            description: "Existing Registration Id"
+            type: string
+            optional: true
+          message:
+            description: "Informational message for shell to display to user"
+            type: string
+            optional: true
+          informationalURL:
+            description: "Informational HTTP web page for metrics"
+            type: string
+            optional: true
+          userReminder:
+            description: "Message to display to user to remind them about service"
+            type: string
+            optional: true
+          resendRegistration:
+            description: "If true, resend registration to server"
+            type: bool
+            optional: true