Add test case from original report

plugins/inputs/gnmi/testcases/issue_14530/expected.out

@@ -0,0 +1 @@
+ifcounters,name=Ethernet35,path=/interfaces/interface/state/counters,source=127.0.0.1 in_broadcast_pkts=0u,in_discards=0u,in_errors=0u,in_fcs_errors=0u,in_multicast_pkts=0u,in_octets=0u,in_pkts=0u,in_unicast_pkts=0u,out_broadcast_pkts=0u,out_discards=0u,out_errors=0u,out_multicast_pkts=0u,out_octets=0u,out_pkts=0u,out_unicast_pkts=0u 1704442117721474264

plugins/inputs/gnmi/testcases/issue_14530/responses.json

@@ -0,0 +1,208 @@
+[
+  {
+    "update": {
+      "timestamp": "1704442117721474264",
+      "prefix": {
+        "elem": [
+          {
+            "name": "interfaces"
+          },
+          {
+            "name": "interface",
+            "key": {
+              "name": "Ethernet35"
+            }
+          },
+          {
+            "name": "state"
+          },
+          {
+            "name": "counters"
+          }
+        ]
+      },
+      "update": [
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "in-broadcast-pkts"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "in-discards"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "in-errors"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "in-fcs-errors"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "in-multicast-pkts"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "in-octets"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "in-pkts"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "in-unicast-pkts"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "out-broadcast-pkts"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "out-discards"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "out-errors"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "out-multicast-pkts"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "out-octets"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "out-pkts"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        },
+        {
+          "path": {
+            "elem": [
+              {
+                "name": "out-unicast-pkts"
+              }
+            ]
+          },
+          "val": {
+            "uintVal": "0"
+          }
+        }
+      ]
+    }
+  }
+]

plugins/inputs/gnmi/testcases/issue_14530/telegraf.conf

@@ -0,0 +1,14 @@
+[[inputs.gnmi]]
+  addresses = ["dummy"]
+  encoding = "json_ietf"
+  tagexclude = ["path"]
+
+  [inputs.gnmi.tags]
+    test_tag = "test"
+
+  [[inputs.gnmi.subscription]]
+    name = "ifcounters"
+    origin = "openconfig"
+    path = "/interfaces/interface/state/counters"
+    subscription_mode = "sample"
+    sample_interval = "10s"