From 1dd6b0eac2b1da1ee79b1913739032c5b2cb03cf Mon Sep 17 00:00:00 2001
From: Martin Helmich <kontakt@martin-helmich.de>
Date: Fri, 1 May 2020 14:07:47 +0200
Subject: [PATCH 1/2] Add option to change metrics endpoint

---
 config/loader_flags.go | 5 +++--
 config/structs.go      | 6 ++++--
 example-config.hcl     | 5 +++++
 go.sum                 | 1 +
 main.go                | 6 ++++--
 5 files changed, 17 insertions(+), 6 deletions(-)

diff --git a/config/loader_flags.go b/config/loader_flags.go
index f3d5a37..44767e7 100644
--- a/config/loader_flags.go
+++ b/config/loader_flags.go
@@ -4,8 +4,9 @@ package config
 // values from command-line flags.
 func LoadConfigFromFlags(config *Config, flags *StartupFlags) error {
 	config.Listen = ListenConfig{
-		Port:    flags.ListenPort,
-		Address: "0.0.0.0",
+		Port:            flags.ListenPort,
+		Address:         "0.0.0.0",
+		MetricsEndpoint: flags.MetricsEndpoint,
 	}
 	config.Namespaces = []NamespaceConfig{
 		{
diff --git a/config/structs.go b/config/structs.go
index 72628ca..1f78407 100644
--- a/config/structs.go
+++ b/config/structs.go
@@ -9,6 +9,7 @@ type StartupFlags struct {
 	Namespace                  string
 	ListenPort                 int
 	EnableExperimentalFeatures bool
+	MetricsEndpoint            string
 
 	CPUProfile string
 	MemProfile string
@@ -29,8 +30,9 @@ type Config struct {
 
 // ListenConfig is a struct describing the built-in webserver configuration
 type ListenConfig struct {
-	Port    int
-	Address string
+	Port            int
+	Address         string
+	MetricsEndpoint string `hcl:"metrics_endpoint" yaml:"metrics_endpoint"`
 }
 
 // ConsulConfig describes the connection to a Consul server that the exporter should
diff --git a/example-config.hcl b/example-config.hcl
index fc06918..9adecc0 100644
--- a/example-config.hcl
+++ b/example-config.hcl
@@ -1,5 +1,10 @@
 listen {
   port = 4040
+  
+  // "metrics_endpoint" can be used to configure an alternative metrics URL
+  // path. Default value is "/metrics".
+  //
+  //   metrics_endpoint = "/metrics"
 }
 
 consul {
diff --git a/go.sum b/go.sum
index 5f05dba..0273161 100644
--- a/go.sum
+++ b/go.sum
@@ -110,6 +110,7 @@ github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXf
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
diff --git a/main.go b/main.go
index c436f4c..901b810 100644
--- a/main.go
+++ b/main.go
@@ -133,8 +133,9 @@ func main() {
 	var opts config.StartupFlags
 	var cfg = config.Config{
 		Listen: config.ListenConfig{
-			Port:    4040,
-			Address: "0.0.0.0",
+			Port:            4040,
+			Address:         "0.0.0.0",
+			MetricsEndpoint: "/metrics",
 		},
 	}
 
@@ -145,6 +146,7 @@ func main() {
 	flag.BoolVar(&opts.EnableExperimentalFeatures, "enable-experimental", false, "Set this flag to enable experimental features")
 	flag.StringVar(&opts.CPUProfile, "cpuprofile", "", "write cpu profile to `file`")
 	flag.StringVar(&opts.MemProfile, "memprofile", "", "write memory profile to `file`")
+	flag.StringVar(&opts.MetricsEndpoint, "metrics-endpoint", cfg.Listen.MetricsEndpoint, "URL path at which to serve metrics")
 	flag.Parse()
 
 	opts.Filenames = flag.Args()

From 0975b098691271b033aba685804dfb0181c3a841 Mon Sep 17 00:00:00 2001
From: Martin Helmich <kontakt@martin-helmich.de>
Date: Fri, 1 May 2020 14:08:50 +0200
Subject: [PATCH 2/2] Adjust example in README

---
 README.adoc | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.adoc b/README.adoc
index aead7e9..74c61d9 100644
--- a/README.adoc
+++ b/README.adoc
@@ -77,6 +77,7 @@ is expected to be either in https://github.com/hashicorp/hcl[HCL] or YAML format
 listen {
   port = 4040
   address = "10.1.2.3"
+  metrics_endpoint = "/metrics"
 }
 
 consul {
@@ -126,6 +127,7 @@ The same file as YAML file:
 listen:
   port: 4040
   address: "10.1.2.3"
+  metrics_endpoint: "/metrics"
 
 consul:
   enable: true