fix(inputs.gnmi): Add option to guess path tag from subscription (#14951)

migrations/all/inputs_gnmi.go

@@ -0,0 +1,5 @@
+//go:build !custom || (migrations && (inputs || inputs.gnmi))
+
+package all
+
+import _ "github.com/influxdata/telegraf/migrations/inputs_gnmi" // register migration

migrations/inputs_gnmi/migration.go

@@ -0,0 +1,47 @@
+package inputs_gnmi
+
+import (
+	"github.com/influxdata/toml"
+	"github.com/influxdata/toml/ast"
+
+	"github.com/influxdata/telegraf/migrations"
+)
+
+// Migration function
+func migrate(tbl *ast.Table) ([]byte, string, error) {
+	// Decode the old data structure
+	var plugin map[string]interface{}
+	if err := toml.UnmarshalTable(tbl, &plugin); err != nil {
+		return nil, "", err
+	}
+
+	// Check for deprecated option(s) and migrate them
+	var applied bool
+	if raw, found := plugin["guess_path_tag"]; found {
+		applied = true
+
+		if v, ok := raw.(bool); ok && v {
+			plugin["path_guessing_strategy"] = "common path"
+		}
+
+		// Remove the ignored setting
+		delete(plugin, "guess_path_tag")
+	}
+
+	// No options migrated so we can exit early
+	if !applied {
+		return nil, "", migrations.ErrNotApplicable
+	}
+
+	// Create the corresponding plugin configurations
+	cfg := migrations.CreateTOMLStruct("inputs", "gnmi")
+	cfg.Add("inputs", "gnmi", plugin)
+
+	output, err := toml.Marshal(cfg)
+	return output, "", err
+}
+
+// Register the migration function for the plugin type
+func init() {
+	migrations.AddPluginOptionMigration("inputs.gnmi", migrate)
+}

migrations/inputs_gnmi/migration_test.go

@@ -0,0 +1,73 @@
+package inputs_gnmi_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/influxdata/telegraf/config"
+	_ "github.com/influxdata/telegraf/migrations/inputs_gnmi" // register migration
+	"github.com/influxdata/telegraf/plugins/inputs/gnmi"
+)
+
+func TestNoMigration(t *testing.T) {
+	plugin := &gnmi.GNMI{}
+	defaultCfg := []byte(plugin.SampleConfig())
+
+	// Migrate and check that nothing changed
+	output, n, err := config.ApplyMigrations(defaultCfg)
+	require.NoError(t, err)
+	require.NotEmpty(t, output)
+	require.Zero(t, n)
+	require.Equal(t, string(defaultCfg), string(output))
+}
+
+func TestCases(t *testing.T) {
+	// Get all directories in testdata
+	folders, err := os.ReadDir("testcases")
+	require.NoError(t, err)
+
+	for _, f := range folders {
+		// Only handle folders
+		if !f.IsDir() {
+			continue
+		}
+
+		t.Run(f.Name(), func(t *testing.T) {
+			testcasePath := filepath.Join("testcases", f.Name())
+			inputFile := filepath.Join(testcasePath, "telegraf.conf")
+			expectedFile := filepath.Join(testcasePath, "expected.conf")
+
+			// Read the expected output
+			expected := config.NewConfig()
+			require.NoError(t, expected.LoadConfig(expectedFile))
+			require.NotEmpty(t, expected.Inputs)
+
+			// Read the input data
+			input, remote, err := config.LoadConfigFile(inputFile)
+			require.NoError(t, err)
+			require.False(t, remote)
+			require.NotEmpty(t, input)
+
+			// Migrate
+			output, n, err := config.ApplyMigrations(input)
+			require.NoError(t, err)
+			require.NotEmpty(t, output)
+			require.GreaterOrEqual(t, n, uint64(1))
+			actual := config.NewConfig()
+			require.NoError(t, actual.LoadConfigData(output))
+
+			// Test the output
+			require.Len(t, actual.Inputs, len(expected.Inputs))
+			actualIDs := make([]string, 0, len(expected.Inputs))
+			expectedIDs := make([]string, 0, len(expected.Inputs))
+			for i := range actual.Inputs {
+				actualIDs = append(actualIDs, actual.Inputs[i].ID())
+				expectedIDs = append(expectedIDs, expected.Inputs[i].ID())
+			}
+			require.ElementsMatch(t, expectedIDs, actualIDs, string(output))
+		})
+	}
+}

migrations/inputs_gnmi/testcases/deprecated_guess_path/expected.conf

@@ -0,0 +1,11 @@
+[[inputs.gnmi]]
+addresses = ["10.49.234.114:57777"]
+password = "cisco"
+path_guessing_strategy = "common path"
+username = "cisco"
+[[inputs.gnmi.subscription]]
+name = "ifcounters"
+origin = "openconfig-interfaces"
+path = "/interfaces/interface/state/counters"
+subscription_mode = "sample"
+sample_interval = "10s"

migrations/inputs_gnmi/testcases/deprecated_guess_path/telegraf.conf

@@ -0,0 +1,109 @@
+# gNMI telemetry input plugin
+[[inputs.gnmi]]
+  ## Address and port of the gNMI GRPC server
+  addresses = ["10.49.234.114:57777"]
+
+  ## define credentials
+  username = "cisco"
+  password = "cisco"
+
+  ## gNMI encoding requested (one of: "proto", "json", "json_ietf", "bytes")
+  # encoding = "proto"
+
+  ## redial in case of failures after
+  # redial = "10s"
+
+  ## gRPC Maximum Message Size
+  # max_msg_size = "4MB"
+
+  ## Enable to get the canonical path as field-name
+  # canonical_field_names = false
+
+  ## Remove leading slashes and dots in field-name
+  # trim_field_names = false
+
+  ## Guess the path-tag if an update does not contain a prefix-path
+  ## If enabled, the common-path of all elements in the update is used.
+  guess_path_tag = true
+
+  ## enable client-side TLS and define CA to authenticate the device
+  # enable_tls = false
+  # tls_ca = "/etc/telegraf/ca.pem"
+  ## Minimal TLS version to accept by the client
+  # tls_min_version = "TLS12"
+  ## Use TLS but skip chain & host verification
+  # insecure_skip_verify = true
+
+  ## define client-side TLS certificate & key to authenticate to the device
+  # tls_cert = "/etc/telegraf/cert.pem"
+  # tls_key = "/etc/telegraf/key.pem"
+
+  ## gNMI subscription prefix (optional, can usually be left empty)
+  ## See: https://github.com/openconfig/reference/blob/master/rpc/gnmi/gnmi-specification.md#222-paths
+  # origin = ""
+  # prefix = ""
+  # target = ""
+
+  ## Vendor specific options
+  ## This defines what vendor specific options to load.
+  ## * Juniper Header Extension (juniper_header): some sensors are directly managed by
+  ##   Linecard, which adds the Juniper GNMI Header Extension. Enabling this
+  ##   allows the decoding of the Extension header if present. Currently this knob
+  ##   adds component, component_id & sub_component_id as additional tags
+  # vendor_specific = []
+
+  ## Define additional aliases to map encoding paths to measurement names
+  # [inputs.gnmi.aliases]
+  #   ifcounters = "openconfig:/interfaces/interface/state/counters"
+
+  [[inputs.gnmi.subscription]]
+    ## Name of the measurement that will be emitted
+    name = "ifcounters"
+
+    ## Origin and path of the subscription
+    ## See: https://github.com/openconfig/reference/blob/master/rpc/gnmi/gnmi-specification.md#222-paths
+    ##
+    ## origin usually refers to a (YANG) data model implemented by the device
+    ## and path to a specific substructure inside it that should be subscribed
+    ## to (similar to an XPath). YANG models can be found e.g. here:
+    ## https://github.com/YangModels/yang/tree/master/vendor/cisco/xr
+    origin = "openconfig-interfaces"
+    path = "/interfaces/interface/state/counters"
+
+    ## Subscription mode ("target_defined", "sample", "on_change") and interval
+    subscription_mode = "sample"
+    sample_interval = "10s"
+
+    ## Suppress redundant transmissions when measured values are unchanged
+    # suppress_redundant = false
+
+    ## If suppression is enabled, send updates at least every X seconds anyway
+    # heartbeat_interval = "60s"
+
+  ## Tag subscriptions are applied as tags to other subscriptions.
+  # [[inputs.gnmi.tag_subscription]]
+  #  ## When applying this value as a tag to other metrics, use this tag name
+  #  name = "descr"
+  #
+  #  ## All other subscription fields are as normal
+  #  origin = "openconfig-interfaces"
+  #  path = "/interfaces/interface/state"
+  #  subscription_mode = "on_change"
+  #
+  #  ## Match strategy to use for the tag.
+  #  ## Tags are only applied for metrics of the same address. The following
+  #  ## settings are valid:
+  #  ##   unconditional -- always match
+  #  ##   name          -- match by the "name" key
+  #  ##                    This resembles the previsou 'tag-only' behavior.
+  #  ##   elements      -- match by the keys in the path filtered by the path
+  #  ##                    parts specified `elements` below
+  #  ## By default, 'elements' is used if the 'elements' option is provided,
+  #  ## otherwise match by 'name'.
+  #  # match = ""
+  #
+  #  ## For the 'elements' match strategy, at least one path-element name must
+  #  ## be supplied containing at least one key to match on. Multiple path
+  #  ## elements can be specified in any order. All given keys must be equal
+  #  ## for a match.
+  #  # elements = ["description", "interface"]

migrations/inputs_gnmi/testcases/deprecated_guess_path_false/expected.conf

@@ -0,0 +1,10 @@
+[[inputs.gnmi]]
+addresses = ["10.49.234.114:57777"]
+password = "cisco"
+username = "cisco"
+[[inputs.gnmi.subscription]]
+name = "ifcounters"
+origin = "openconfig-interfaces"
+path = "/interfaces/interface/state/counters"
+subscription_mode = "sample"
+sample_interval = "10s"

migrations/inputs_gnmi/testcases/deprecated_guess_path_false/telegraf.conf

@@ -0,0 +1,109 @@
+# gNMI telemetry input plugin
+[[inputs.gnmi]]
+  ## Address and port of the gNMI GRPC server
+  addresses = ["10.49.234.114:57777"]
+
+  ## define credentials
+  username = "cisco"
+  password = "cisco"
+
+  ## gNMI encoding requested (one of: "proto", "json", "json_ietf", "bytes")
+  # encoding = "proto"
+
+  ## redial in case of failures after
+  # redial = "10s"
+
+  ## gRPC Maximum Message Size
+  # max_msg_size = "4MB"
+
+  ## Enable to get the canonical path as field-name
+  # canonical_field_names = false
+
+  ## Remove leading slashes and dots in field-name
+  # trim_field_names = false
+
+  ## Guess the path-tag if an update does not contain a prefix-path
+  ## If enabled, the common-path of all elements in the update is used.
+  guess_path_tag = false
+
+  ## enable client-side TLS and define CA to authenticate the device
+  # enable_tls = false
+  # tls_ca = "/etc/telegraf/ca.pem"
+  ## Minimal TLS version to accept by the client
+  # tls_min_version = "TLS12"
+  ## Use TLS but skip chain & host verification
+  # insecure_skip_verify = true
+
+  ## define client-side TLS certificate & key to authenticate to the device
+  # tls_cert = "/etc/telegraf/cert.pem"
+  # tls_key = "/etc/telegraf/key.pem"
+
+  ## gNMI subscription prefix (optional, can usually be left empty)
+  ## See: https://github.com/openconfig/reference/blob/master/rpc/gnmi/gnmi-specification.md#222-paths
+  # origin = ""
+  # prefix = ""
+  # target = ""
+
+  ## Vendor specific options
+  ## This defines what vendor specific options to load.
+  ## * Juniper Header Extension (juniper_header): some sensors are directly managed by
+  ##   Linecard, which adds the Juniper GNMI Header Extension. Enabling this
+  ##   allows the decoding of the Extension header if present. Currently this knob
+  ##   adds component, component_id & sub_component_id as additional tags
+  # vendor_specific = []
+
+  ## Define additional aliases to map encoding paths to measurement names
+  # [inputs.gnmi.aliases]
+  #   ifcounters = "openconfig:/interfaces/interface/state/counters"
+
+  [[inputs.gnmi.subscription]]
+    ## Name of the measurement that will be emitted
+    name = "ifcounters"
+
+    ## Origin and path of the subscription
+    ## See: https://github.com/openconfig/reference/blob/master/rpc/gnmi/gnmi-specification.md#222-paths
+    ##
+    ## origin usually refers to a (YANG) data model implemented by the device
+    ## and path to a specific substructure inside it that should be subscribed
+    ## to (similar to an XPath). YANG models can be found e.g. here:
+    ## https://github.com/YangModels/yang/tree/master/vendor/cisco/xr
+    origin = "openconfig-interfaces"
+    path = "/interfaces/interface/state/counters"
+
+    ## Subscription mode ("target_defined", "sample", "on_change") and interval
+    subscription_mode = "sample"
+    sample_interval = "10s"
+
+    ## Suppress redundant transmissions when measured values are unchanged
+    # suppress_redundant = false
+
+    ## If suppression is enabled, send updates at least every X seconds anyway
+    # heartbeat_interval = "60s"
+
+  ## Tag subscriptions are applied as tags to other subscriptions.
+  # [[inputs.gnmi.tag_subscription]]
+  #  ## When applying this value as a tag to other metrics, use this tag name
+  #  name = "descr"
+  #
+  #  ## All other subscription fields are as normal
+  #  origin = "openconfig-interfaces"
+  #  path = "/interfaces/interface/state"
+  #  subscription_mode = "on_change"
+  #
+  #  ## Match strategy to use for the tag.
+  #  ## Tags are only applied for metrics of the same address. The following
+  #  ## settings are valid:
+  #  ##   unconditional -- always match
+  #  ##   name          -- match by the "name" key
+  #  ##                    This resembles the previsou 'tag-only' behavior.
+  #  ##   elements      -- match by the keys in the path filtered by the path
+  #  ##                    parts specified `elements` below
+  #  ## By default, 'elements' is used if the 'elements' option is provided,
+  #  ## otherwise match by 'name'.
+  #  # match = ""
+  #
+  #  ## For the 'elements' match strategy, at least one path-element name must
+  #  ## be supplied containing at least one key to match on. Multiple path
+  #  ## elements can be specified in any order. All given keys must be equal
+  #  ## for a match.
+  #  # elements = ["description", "interface"]

plugins/inputs/gnmi/README.md

@@ -62,8 +62,11 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   # trim_field_names = false
 
   ## Guess the path-tag if an update does not contain a prefix-path
-  ## If enabled, the common-path of all elements in the update is used.
+  ## Supported values are
-  # guess_path_tag = false
+  ##   none         -- do not add a 'path' tag
+  ##   common path  -- use the common path elements of all fields in an update
+  ##   subscription -- use the subscription path
+  # path_guessing_strategy = "none"
 
   ## enable client-side TLS and define CA to authenticate the device
   # enable_tls = false
@@ -163,12 +166,14 @@ ifcounters,path=openconfig-interfaces:/interfaces/interface/state/counters,host=
 
 ## Troubleshooting
 
+### Empty metric-name warning
+
 Some devices (e.g. Juniper) report spurious data with response paths not
 corresponding to any subscription. In those cases, Telegraf will not be able
 to determine the metric name for the response and you get an
 *empty metric-name warning*
 
-For examplem if you subscribe to `/junos/system/linecard/cpu/memory` but the
+For example if you subscribe to `/junos/system/linecard/cpu/memory` but the
 corresponding response arrives with path
 `/components/component/properties/property/...` To avoid those issues, you can
 manually map the response to a metric name using the `aliases` option like
@@ -190,3 +195,14 @@ manually map the response to a metric name using the `aliases` option like
 
 If this does *not* solve the issue, please follow the warning instructions and
 open an issue with the response, your configuration and the metric you expect.
+
+### Missing `path` tag
+
+Some devices (e.g. Arista) omit the prefix and specify the path in the update
+if there is only one value reported. This leads to a missing `path` tag for
+the resulting metrics. In those cases you should set `path_guessing_strategy`
+to `subscription` to use the subscription path as `path` tag.
+
+Other devices might omit the prefix in updates altogether. Here setting
+`path_guessing_strategy` to `common path` can help to infer the `path` tag by
+using the part of the path that is common to all values in the update.

plugins/inputs/gnmi/gnmi.go

@@ -54,7 +54,8 @@ type GNMI struct {
 	Trace               bool              `toml:"dump_responses"`
 	CanonicalFieldNames bool              `toml:"canonical_field_names"`
 	TrimFieldNames      bool              `toml:"trim_field_names"`
-	GuessPathTag        bool              `toml:"guess_path_tag"`
+	GuessPathTag        bool              `toml:"guess_path_tag" deprecated:"1.30.0;use 'path_guessing_strategy' instead"`
+	GuessPathStrategy   string            `toml:"path_guessing_strategy"`
 	EnableTLS           bool              `toml:"enable_tls" deprecated:"1.27.0;use 'tls_enable' instead"`
 	Log                 telegraf.Logger   `toml:"-"`
 	internaltls.ClientConfig
@@ -67,29 +68,23 @@ type GNMI struct {
 
 // Subscription for a gNMI client
 type Subscription struct {
-	Name   string
+	Name              string          `toml:"name"`
-	Origin string
+	Origin            string          `toml:"origin"`
-	Path   string
+	Path              string          `toml:"path"`
-
-	fullPath *gnmiLib.Path
-
-	// Subscription mode and interval
 	SubscriptionMode  string          `toml:"subscription_mode"`
 	SampleInterval    config.Duration `toml:"sample_interval"`
-
-	// Duplicate suppression
 	SuppressRedundant bool            `toml:"suppress_redundant"`
 	HeartbeatInterval config.Duration `toml:"heartbeat_interval"`
-
-	// Mark this subscription as a tag-only lookup source, not emitting any metric
 	TagOnly           bool            `toml:"tag_only" deprecated:"1.25.0;2.0.0;please use 'tag_subscription's instead"`
+
+	fullPath *gnmiLib.Path
 }
 
 // Tag Subscription for a gNMI client
 type TagSubscription struct {
 	Subscription
 	Match    string   `toml:"match"`
-	Elements []string
+	Elements []string `toml:"elements"`
 }
 
 func (*GNMI) SampleConfig() string {
@@ -107,6 +102,21 @@ func (c *GNMI) Init() error {
 		return fmt.Errorf("unsupported vendor_specific option: %w", err)
 	}
 
+	// Check path guessing and handle deprecated option
+	if c.GuessPathTag {
+		if c.GuessPathStrategy == "" {
+			c.GuessPathStrategy = "common path"
+		}
+		if c.GuessPathStrategy != "common path" {
+			return errors.New("conflicting settings between 'guess_path_tag' and 'path_guessing_strategy'")
+		}
+	}
+	switch c.GuessPathStrategy {
+	case "", "none", "common path", "subscription":
+	default:
+		return fmt.Errorf("invalid 'path_guessing_strategy' %q", c.GuessPathStrategy)
+	}
+
 	// Use the new TLS option for enabling
 	// Honor deprecated option
 	enable := (c.ClientConfig.Enable != nil && *c.ClientConfig.Enable) || c.EnableTLS
@@ -221,7 +231,7 @@ func (c *GNMI) Start(acc telegraf.Accumulator) error {
 				trace:               c.Trace,
 				canonicalFieldNames: c.CanonicalFieldNames,
 				trimSlash:           c.TrimFieldNames,
-				guessPathTag:        c.GuessPathTag,
+				guessPathStrategy:   c.GuessPathStrategy,
 				log:                 c.Log,
 			}
 			for ctx.Err() == nil {

plugins/inputs/gnmi/handler.go

@@ -40,7 +40,7 @@ type handler struct {
 	trace               bool
 	canonicalFieldNames bool
 	trimSlash           bool
-	guessPathTag        bool
+	guessPathStrategy   string
 	log                 telegraf.Logger
 }
 
@@ -198,7 +198,7 @@ func (h *handler) handleSubscribeResponseUpdate(acc telegraf.Accumulator, respon
 
 	// Some devices do not provide a prefix, so do some guesswork based
 	// on the paths of the fields
-	if headerTags["path"] == "" && h.guessPathTag {
+	if headerTags["path"] == "" && h.guessPathStrategy == "common path" {
 		if prefixPath := guessPrefixFromUpdate(valueFields); prefixPath != "" {
 			headerTags["path"] = prefixPath
 		}
@@ -232,6 +232,10 @@ func (h *handler) handleSubscribeResponseUpdate(acc telegraf.Accumulator, respon
 		}
 		aliasInfo := newInfoFromString(aliasPath)
 
+		if tags["path"] == "" && h.guessPathStrategy == "subscription" {
+			tags["path"] = aliasInfo.String()
+		}
+
 		// Group metrics
 		var key string
 		if h.canonicalFieldNames {

plugins/inputs/gnmi/sample.conf

@@ -23,8 +23,11 @@
   # trim_field_names = false
 
   ## Guess the path-tag if an update does not contain a prefix-path
-  ## If enabled, the common-path of all elements in the update is used.
+  ## Supported values are
-  # guess_path_tag = false
+  ##   none         -- do not add a 'path' tag
+  ##   common path  -- use the common path elements of all fields in an update
+  ##   subscription -- use the subscription path
+  # path_guessing_strategy = "none"
 
   ## enable client-side TLS and define CA to authenticate the device
   # enable_tls = false

plugins/inputs/gnmi/testcases/issue_14044/telegraf.conf

@@ -3,7 +3,8 @@
   name_override = "gnmi"
   redial        = "10s"
   encoding      = "json_ietf"
-  guess_path_tag = true
+  path_guessing_strategy = "common path"
+
   [[inputs.gnmi.subscription]]
     name = "ifdesc"
     origin = "openconfig-interfaces"

plugins/inputs/gnmi/testcases/issue_14946/expected.out

@@ -0,0 +1,4 @@
+gnmi_sys_memory,path=/system/memory/state,source=127.0.0.1 reserved=6359478272u,used=3479629824u 1709737743568119333
+gnmi_sys_memory,path=/system/memory/state,source=127.0.0.1 used=3479527424u 1709737753565697718
+gnmi_sys_cpu,index=ALL,path=/system/cpus/cpu/state,source=127.0.0.1 hardware_interrupt/min_time=1709805333568034887u 1709805333566280930
+gnmi_sys_cpu,index=ALL,path=/system/cpus/cpu/state,source=127.0.0.1 hardware_interrupt/min_time=1709805343567684412u,idle/avg=89u,idle/instant=90u 1709805343565718902

plugins/inputs/gnmi/testcases/issue_14946/responses.json

@@ -0,0 +1,182 @@
+[
+    {
+        "update": {
+            "timestamp": "1709737743568119333",
+            "prefix": {
+                "elem": [
+                    {
+                        "name": "system"
+                    },
+                    {
+                        "name": "memory"
+                    },
+                    {
+                        "name": "state"
+                    }
+                ]
+            },
+            "update": [
+                {
+                    "path": {
+                        "elem": [
+                            {
+                                "name": "reserved"
+                            }
+                        ]
+                    },
+                    "val": {
+                        "uintVal": "6359478272"
+                    }
+                },
+                {
+                    "path": {
+                        "elem": [
+                            {
+                                "name": "used"
+                            }
+                        ]
+                    },
+                    "val": {
+                        "uintVal": "3479629824"
+                    }
+                }
+            ]
+        }
+    },
+    {
+        "update": {
+            "timestamp": "1709737753565697718",
+            "update": [
+                {
+                    "path": {
+                        "elem": [
+                            {
+                                "name": "system"
+                            },
+                            {
+                                "name": "memory"
+                            },
+                            {
+                                "name": "state"
+                            },
+                            {
+                                "name": "used"
+                            }
+                        ]
+                    },
+                    "val": {
+                        "uintVal": "3479527424"
+                    }
+                }
+            ]
+        }
+    },
+    {
+        "update": {
+            "timestamp": "1709805333566280930",
+            "update": [
+                {
+                    "path": {
+                        "elem": [
+                            {
+                                "name": "system"
+                            },
+                            {
+                                "name": "cpus"
+                            },
+                            {
+                                "name": "cpu",
+                                "key": {
+                                    "index": "ALL"
+                                }
+                            },
+                            {
+                                "name": "state"
+                            },
+                            {
+                                "name": "hardware-interrupt"
+                            },
+                            {
+                                "name": "min-time"
+                            }
+                        ]
+                    },
+                    "val": {
+                        "uintVal": "1709805333568034887"
+                    }
+                }
+            ]
+        }
+    },
+    {
+        "update": {
+            "timestamp": "1709805343565718902",
+            "prefix": {
+                "elem": [
+                    {
+                        "name": "system"
+                    },
+                    {
+                        "name": "cpus"
+                    },
+                    {
+                        "name": "cpu",
+                        "key": {
+                            "index": "ALL"
+                        }
+                    },
+                    {
+                        "name": "state"
+                    }
+                ]
+            },
+            "update": [
+                {
+                    "path": {
+                        "elem": [
+                            {
+                                "name": "hardware-interrupt"
+                            },
+                            {
+                                "name": "min-time"
+                            }
+                        ]
+                    },
+                    "val": {
+                        "uintVal": "1709805343567684412"
+                    }
+                },
+                {
+                    "path": {
+                        "elem": [
+                            {
+                                "name": "idle"
+                            },
+                            {
+                                "name": "avg"
+                            }
+                        ]
+                    },
+                    "val": {
+                        "uintVal": "89"
+                    }
+                },
+                {
+                    "path": {
+                        "elem": [
+                            {
+                                "name": "idle"
+                            },
+                            {
+                                "name": "instant"
+                            }
+                        ]
+                    },
+                    "val": {
+                        "uintVal": "90"
+                    }
+                }
+            ]
+        }
+    }
+]

plugins/inputs/gnmi/testcases/issue_14946/telegraf.conf

@@ -0,0 +1,15 @@
+[[inputs.gnmi]]
+  addresses = ["dummy"]
+  path_guessing_strategy = "subscription"
+
+  [[inputs.gnmi.subscription]]
+    name = "gnmi_sys_cpu"
+    path = "/system/cpus/cpu/state"
+    subscription_mode = "sample"
+    sample_interval = "10s"
+
+  [[inputs.gnmi.subscription]]
+    name = "gnmi_sys_memory"
+    path = "/system/memory/state"
+    subscription_mode = "sample"
+    sample_interval = "10s"