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+..
+   SPDX-FileCopyrightText: 2023-present Intel Corporation
+   SPDX-FileCopyrightText: © 2020 Open Networking Foundation <support@opennetworking.org>
+   SPDX-License-Identifier: Apache-2.0
+
+.. _design_metricfunc:
+
+Metric Function Design Overview
+===============================
+
+.. image:: ../_static/images/Metric_Func_Arch.png
+  :width: 500px
+
+Metric-Function
+---------------
+
+The Metric Function act as an aggregator and processor of metrics received from different 5G Network Functions.
+Currently, only SMF and AMF publishes metrics to the Metric Function as of this release.
+
+The Metric Function provides following features
+
+* API Service exposure
+    It provides APIs to fetch various metrics as mentioned below
+        * GetSubscriberAll (/nmetric-func/v1/subscriber/all)
+        * GetSubscriberSummary (/nmetric-func/v1/subscriber/<imsi>)
+        * GetNfStatus (/nmetric-func/v1/nfstatus/<GNB/UPF>)
+        * GetNfServiceStats (/nmetric-func/v1/nfServiceStatsSummary/<AMF/SMF>) (not supported in this release)
+        * GetNfServiceStatsAll (/nmetric-func/v1/nfServiceStats/all) (not supported in this release)
+* Prometheus Client exposure
+    * It exposes Prometheus client interface for metrics scraping via Prometheus server
+* Analytics Function exposure(not supported in this release)
+    * It shall push events to configured Analytics Function.
+
+
+Sample output from API Service
+------------------------------
+* GetSubscriberAll (/nmetric-func/v1/subscriber/all)
+
+    .. code-block::
+
+        http://<metricfunc-pod-ip>:9301/nmetric-func/v1/subscriber/all
+
+        ["imsi-208930100007487","imsi-208930100007488","imsi-208930100007489","imsi-208930100007490","imsi-208930100007491"]
+
+
+* GetSubscriberSummary (/nmetric-func/v1/subscriber/<imsi>)
+
+    .. code-block::
+
+        http://<metricfunc-pod-ip>:9301/nmetric-func/v1/subscriber/imsi-208930100007487
+        {
+            "imsi":"imsi-208930100007487",
+            "smfId":"urn:uuid:c573621f-e198-4f67-988b-f7373e67601c","smfIp":"192.168.84.172",
+            "smfSubState":"Connected","ipaddress":"172.250.237.121","dnn":"internet","slice":"sd:010203 sst:1",
+            "upfid":"upf","upfAddr":"192.168.85.188",
+            "amfId":"b17f4726-4809-43e6-b5b6-afa0fc72807b","guti":"20893cafe00002647e6","tmsi":2508774,"amfngapId":2508775,
+            "ranngapId":3405774848,"amfSubState":"Registered","gnbid":"208:93:000102","tacid":"000001","amfIp":"192.168.84.159"
+        }
+
+* GetNfStatus (/nmetric-func/v1/nfstatus/<GNB/UPF>)
+
+    .. code-block::
+
+        http://<metricfunc-pod-ip>:9301/nmetric-func/v1/nfstatus/UPF
+        [
+            {"nfType":"UPF","nfStatus":"Connected","nfName":"upf-1"},
+            {"nfType":"UPF","nfStatus":"Connected","nfName":"upf-2"}
+        ]
+
+        http://<metricfunc-pod-ip>:9301/nmetric-func/v1/nfstatus/GNB
+        [
+            {"nfType":"GNB","nfStatus":"Disconnected","nfName":"208:93:000112"},
+            {"nfType":"GNB","nfStatus":"Disconnected","nfName":"208:93:000102"}
+        ]
+