Merge pull request #7 from automixer/static_labels

Add static_labels to emitted metrics

Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM golang:1.22.5 AS builder
+FROM --platform=$BUILDPLATFORM golang:1.23.2 AS builder
 
 WORKDIR /app
 COPY . /app

README.md

@@ -40,7 +40,7 @@ Binaries are available for download [here](https://github.com/automixer/gtexport
 The mandatory argument is a config file: ```gtexporter-<OS>-<ARCH> -config <path/to/config/file>```.
 
 ### Build from sources
-Requires ```go 1.22.5``` or higher and ```make```.
+Requires ```go 1.23.2``` or higher and ```make```.
 ```
 git clone https://github.com/automixer/gtexporter.git
 cd gtexporter

config-keys.yaml

@@ -5,8 +5,12 @@ global:
                                       # It must satisfy the regex ^[a-zA-Z0-9_]*$
   listen_address: 0.0.0.0             # Prometheus exporter listen address. Defaults to 0.0.0.0
   listen_port: 9456                   # Prometheus exporter listen port. Defaults to 9456
+  listen_path: /metrics               # Http endpoint for Prometheus scraping.
   scrape_interval: 1m                 # The scrape interval configured on Prometheus server. No less than 1 second.
-
+  static_labels:                      # User defined labels/values to be added to all metrics. Can be null.
+    label1: value1
+    label2: value2
+    # etc...
 
 # These keys are shared among all device configurations and are overridden by the device section keys.
 device_template:

go.mod

@@ -1,12 +1,12 @@
 module github.com/automixer/gtexporter
 
-go 1.22.5
+go 1.23.2
 
 require (
 	github.com/golang/glog v1.2.2
 	github.com/openconfig/gnmi v0.11.0
 	github.com/openconfig/ygot v0.29.20
-	github.com/prometheus/client_golang v1.19.1
+	github.com/prometheus/client_golang v1.20.5
 	google.golang.org/grpc v1.65.0
 	gopkg.in/yaml.v2 v2.4.0
 )
@@ -15,15 +15,17 @@ require (
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/google/go-cmp v0.6.0 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
 	github.com/kylelemons/godebug v1.1.0 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/openconfig/goyang v1.4.5 // indirect
-	github.com/prometheus/client_model v0.5.0 // indirect
-	github.com/prometheus/common v0.48.0 // indirect
-	github.com/prometheus/procfs v0.12.0 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.55.0 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
 	golang.org/x/exp v0.0.0-20230801115018-d63ba01acd4b // indirect
-	golang.org/x/net v0.25.0 // indirect
-	golang.org/x/sys v0.20.0 // indirect
-	golang.org/x/text v0.15.0 // indirect
+	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/sys v0.22.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240528184218-531527333157 // indirect
-	google.golang.org/protobuf v1.34.1 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
 )

go.sum

@@ -15,8 +15,6 @@ github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGX
 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
@@ -52,13 +50,17 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/grpc-ecosystem/grpc-gateway v1.16.0/go.mod h1:BDjrQk3hbvj6Nolgz8mAMFbcEtjT1g+wF4CSlocrBnw=
+github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
+github.com/klauspost/compress v1.17.9/go.mod h1:Di0epgTjJY877eYKx5yC51cX2A2Vl2ibi7bDH9ttBbw=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
 github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
 github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
 github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/mitchellh/go-wordwrap v1.0.1/go.mod h1:R62XHJLzvMFRBbcrT7m7WgmE1eOyTSsCt+hzestvNj0=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/openconfig/gnmi v0.10.0/go.mod h1:Y9os75GmSkhHw2wX8sMsxfI7qRGAEcDh8NTa5a8vj6E=
 github.com/openconfig/gnmi v0.11.0 h1:H7pLIb/o3xObu3+x0Fv9DCK7TH3FUh7mNwbYe+34hFw=
 github.com/openconfig/gnmi v0.11.0/go.mod h1:9oJSQPPCpNvfMRj8e4ZoLVAw4wL8HyxXbiDlyuexCGU=
@@ -72,15 +74,15 @@ github.com/openconfig/ygot v0.29.20/go.mod h1:K8HbrPm/v8/emtGQ9+RsJXx6UPKC5JzS/F
 github.com/pborman/getopt v1.1.0/go.mod h1:FxXoW1Re00sQG/+KIkuSqRL/LwQgSkv7uyac+STFsbk=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/prometheus/client_golang v1.19.1 h1:wZWJDwK+NameRJuPGDhlnFgx8e8HN3XHQeLaYJFJBOE=
-github.com/prometheus/client_golang v1.19.1/go.mod h1:mP78NwGzrVks5S2H6ab8+ZZGJLZUq1hoULYBAYBw1Ho=
+github.com/prometheus/client_golang v1.20.5 h1:cxppBPuYhUnsO6yo/aoRol4L7q7UFfdm+bR9r+8l63Y=
+github.com/prometheus/client_golang v1.20.5/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
-github.com/prometheus/client_model v0.5.0 h1:VQw1hfvPvk3Uv6Qf29VrPF32JB6rtbgI6cYPYQjL0Qw=
-github.com/prometheus/client_model v0.5.0/go.mod h1:dTiFglRmd66nLR9Pv9f0mZi7B7fk5Pm3gvsjB5tr+kI=
-github.com/prometheus/common v0.48.0 h1:QO8U2CdOzSn1BBsmXJXduaaW+dY/5QLjfB8svtSzKKE=
-github.com/prometheus/common v0.48.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5EC6ILDTlAPc=
-github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
-github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
+github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
+github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
+github.com/prometheus/common v0.55.0 h1:KEi6DK7lXW/m7Ig5i47x0vRzuBsHuvJdi5ee6Y3G1dc=
+github.com/prometheus/common v0.55.0/go.mod h1:2SECS4xJG1kd8XF9IcM1gMX6510RAEL65zxzNImwdc8=
+github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
+github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
 github.com/protocolbuffers/txtpbfmt v0.0.0-20220608084003-fc78c767cd6a/go.mod h1:KjY0wibdYKc4DYkerHSbguaf3JeIPGhNJBp2BNiFH78=
 github.com/rogpeppe/fastuuid v1.2.0/go.mod h1:jVj6XXZzXRy/MSR5jhDC/2q6DgLz+nrA6LYCDYWNEvQ=
 github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
@@ -112,8 +114,8 @@ golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210805182204-aaa1db679c0d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.25.0 h1:d/OCCoBEUq33pjydKrGQhw7IlUPI2Oylr+8qLx49kac=
-golang.org/x/net v0.25.0/go.mod h1:JkAGAh7GEvH74S6FOH42FLoXpXbE/aqXSrIQjXgsiwM=
+golang.org/x/net v0.26.0 h1:soB7SVo0PWrY4vPW/+ay0jKDNScG2X9wFeYlXIvJsOQ=
+golang.org/x/net v0.26.0/go.mod h1:5YKkiSynbBIh3p6iOc/vibscux0x38BZDkn8sCUPxHE=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@@ -130,16 +132,16 @@ golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20210809222454-d867a43fc93e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.20.0 h1:Od9JTbYCk261bKm4M/mw7AklTlFYIa0bIp9BgSm1S8Y=
-golang.org/x/sys v0.20.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.22.0 h1:RI27ohtqKCnwULzJLqkv897zojh5/DwS/ENaMzUOaWI=
+golang.org/x/sys v0.22.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
-golang.org/x/text v0.15.0 h1:h1V/4gjBv8v9cjcR6+AR5+/cIYK5N/WAgiv4xlsEtAk=
-golang.org/x/text v0.15.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
+golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
@@ -185,8 +187,8 @@ google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp0
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
-google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
-google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c/go.mod h1:JHkPIbrfpd72SG/EVd6muEfDQjcINNoR0C8j2r3qZ4Q=

pkg/core/confmgmt.go

@@ -20,15 +20,25 @@ const (
 	minSessionTTL     = 10 * time.Minute
 )
 
+type yamlGlobalConfig struct {
+	InstanceName   string            `yaml:"instance_name"`
+	MetricPrefix   string            `yaml:"metric_prefix"`
+	ListenAddress  string            `yaml:"listen_address"`
+	ListenPort     string            `yaml:"listen_port"`
+	ListenPath     string            `yaml:"listen_path"`
+	ScrapeInterval string            `yaml:"scrape_interval"`
+	StaticLabels   map[string]string `yaml:"static_labels"`
+}
+
 type yamlDevConfig struct {
 	Keys    map[string]string `yaml:"devices,inline"`
 	Plugins []string          `yaml:"plugins"`
 	Options map[string]string `yaml:"options"`
 }
 
 type yamlConfig struct {
-	Global    map[string]string `yaml:"global"`
-	Templates yamlDevConfig     `yaml:"device_template"`
+	Global    yamlGlobalConfig `yaml:"global"`
+	Templates yamlDevConfig    `yaml:"device_template"`
 	Devices   []yamlDevConfig
 }
 
@@ -97,26 +107,35 @@ func (c *Core) parseAppConfig(yCfg *yamlConfig) error {
 // validateGlobalConfig validates the global configuration section in the configuration file.
 func (c *Core) validateGlobalConfig(yCfg *yamlConfig) error {
 	// Global section
-	if yCfg.Global["instance_name"] == "" {
-		yCfg.Global["instance_name"] = "default"
+	if yCfg.Global.InstanceName == "" {
+		yCfg.Global.InstanceName = "default"
 	}
-	if yCfg.Global["listen_address"] == "" {
-		yCfg.Global["listen_address"] = "0.0.0.0"
+	if yCfg.Global.ListenAddress == "" {
+		yCfg.Global.ListenAddress = "0.0.0.0"
 	}
-	if yCfg.Global["listen_port"] == "" {
-		yCfg.Global["listen_port"] = "9456"
+	if yCfg.Global.ListenPort == "" {
+		yCfg.Global.ListenPort = "9456"
 	}
-	if yCfg.Global["listen_path"] == "" {
-		yCfg.Global["listen_path"] = "/metrics"
+	if yCfg.Global.ListenPath == "" {
+		yCfg.Global.ListenPath = "/metrics"
 	}
 	rx := regexp.MustCompile("^[a-zA-Z0-9_]*$")
-	if !rx.MatchString(yCfg.Global["metric_prefix"]) {
-		return fmt.Errorf("%s is not a valid Prometheus metric name", yCfg.Global["metric_prefix"])
+	if !rx.MatchString(yCfg.Global.MetricPrefix) {
+		return fmt.Errorf("%s is not a valid Prometheus metric name", yCfg.Global.MetricPrefix)
 	}
-	sInt, _ := time.ParseDuration(yCfg.Global["scrape_interval"])
+	sInt, _ := time.ParseDuration(yCfg.Global.ScrapeInterval)
 	if sInt < minScrapeInterval {
 		return fmt.Errorf("scrape interval must be greater than or equal to %s", minScrapeInterval)
 	}
+	if yCfg.Global.StaticLabels == nil {
+		yCfg.Global.StaticLabels = make(map[string]string)
+	} else {
+		for k := range yCfg.Global.StaticLabels {
+			if !rx.MatchString(k) {
+				return fmt.Errorf("%s is not a valid Prometheus static_label name", k)
+			}
+		}
+	}
 	return nil
 }
 
@@ -137,11 +156,14 @@ func (c *Core) validateDeviceConfig(yCfg *yamlDevConfig) error {
 // buildExporterCfg builds the exporter configuration struct based on the provided yamlConfig object.
 func (c *Core) buildExporterCfg(yCfg *yamlConfig) {
 	c.exporterCfg = exporter.Config{
-		ListenAddress: yCfg.Global["listen_address"],
-		ListenPort:    yCfg.Global["listen_port"],
-		ListenPath:    yCfg.Global["listen_path"],
-		InstanceName:  yCfg.Global["instance_name"],
-		MetricPrefix:  yCfg.Global["metric_prefix"],
+		ListenAddress: yCfg.Global.ListenAddress,
+		ListenPort:    yCfg.Global.ListenPort,
+		ListenPath:    yCfg.Global.ListenPath,
+		InstanceName:  yCfg.Global.InstanceName,
+		MetricPrefix:  yCfg.Global.MetricPrefix,
+	}
+	for k, v := range yCfg.Global.StaticLabels {
+		c.exporterCfg.StaticLabels = append(c.exporterCfg.StaticLabels, exporter.StaticLabel{Key: k, Value: v})
 	}
 }
 
@@ -175,7 +197,7 @@ func (c *Core) buildGnmiClientCfg(yCfg *yamlConfig, index int) {
 	// Int values
 	newDev.OverSampling, _ = strconv.ParseInt(src.Keys["oversampling"], 10, 64)
 	// Duration values
-	scrapeInterval, _ := time.ParseDuration(yCfg.Global["scrape_interval"])
+	scrapeInterval, _ := time.ParseDuration(yCfg.Global.ScrapeInterval)
 	newDev.ScrapeInterval = scrapeInterval
 	maxLife, err := time.ParseDuration(src.Keys["max_life"])
 	if err == nil && maxLife < minSessionTTL {
@@ -220,7 +242,7 @@ func (c *Core) buildPluginCfg(yCfg *yamlConfig, index int) {
 			newPlug.CacheData = true
 		}
 		// Duration values
-		scrapeInterval, _ := time.ParseDuration(yCfg.Global["scrape_interval"])
+		scrapeInterval, _ := time.ParseDuration(yCfg.Global.ScrapeInterval)
 		newPlug.ScrapeInterval = scrapeInterval
 		c.plugCfg[src.Keys["name"]] = append(c.plugCfg[src.Keys["name"]], newPlug)
 		// Plugin options

pkg/exporter/exporter.go

@@ -19,12 +19,18 @@ type GMetricSource interface {
 	GetMetrics(ch chan<- GMetric)
 }
 
+type StaticLabel struct {
+	Key   string
+	Value string
+}
+
 type Config struct {
 	ListenAddress string
 	ListenPort    string
 	ListenPath    string
 	InstanceName  string
 	MetricPrefix  string
+	StaticLabels  []StaticLabel
 }
 
 type promExporter struct {
@@ -51,6 +57,9 @@ func New(cfg Config) (*promExporter, error) {
 func (p *promExporter) Start() error {
 	lAddr := p.config.ListenAddress + ":" + p.config.ListenPort
 	if err := prometheus.Register(p); err != nil {
+		log.Errorf(
+			"cannot register Prometheus metric descriptors. " +
+				"please check configured static labels against plugins labels. ")
 		return err
 	}
 	http.Handle(p.config.ListenPath, promhttp.Handler())
@@ -110,6 +119,9 @@ func (p *promExporter) Collect(ch chan<- prometheus.Metric) {
 			}
 			// Prepare labels
 			lv := []string{p.config.InstanceName, commons.Device}
+			for _, slv := range p.config.StaticLabels {
+				lv = append(lv, slv.Value)
+			}
 			lv = append(lv, getLabelValues(gMetric)...)
 			// Send metric to Prom
 			pMetric, err := prometheus.NewConstMetric(desc, commons.Type, commons.Value, lv...)
@@ -170,6 +182,9 @@ func (p *promExporter) registerSource(src GMetricSource, metrics []GMetric) erro
 			continue
 		}
 		labelKeys := []string{"instance_name", "device"}
+		for _, lk := range p.config.StaticLabels {
+			labelKeys = append(labelKeys, lk.Key)
+		}
 		labelKeys = append(labelKeys, getLabelKeys(m)...)
 		p.descriptors[fqName] = prometheus.NewDesc(fqName, commons.Help, labelKeys, nil)
 	}