feat: add metrics to demo app and analysis example

examples/analysis/analysis-success-rate-local.yaml

@@ -0,0 +1,19 @@
+apiVersion: argoproj.io/v1alpha1
+kind: AnalysisTemplate
+metadata:
+  name: success-rate-local
+spec:
+  metrics:
+  - name: canary-success-rate
+    interval: 10s
+    successCondition: len(result) == 0 || result[0] > 0.90
+    initialDelay: 30s
+    provider:
+      prometheus:
+        address: http://prometheus.istio-system.svc.cluster.local:9090
+        query: >+
+          sum(
+            rate(http_requests_total{job="rollouts-demo-preview",status!~"[4-5].*"}[20s]))
+            /
+            sum(rate(http_requests_total{job="rollouts-demo-preview"}[20s])
+          )

examples/analysis/canary-demo-preview-service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: canary-demo-preview
+spec:
+  ports:
+  - port: 80
+    targetPort: http
+    protocol: TCP
+    name: http
+  selector:
+    app: canary-demo

examples/analysis/canary-demo-service.yaml

@@ -0,0 +1,12 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: canary-demo
+spec:
+  ports:
+  - port: 80
+    targetPort: http
+    protocol: TCP
+    name: http
+  selector:
+    app: canary-demo

examples/analysis/kustomization.yaml

@@ -8,3 +8,21 @@ resources:
 - ../canary/canary-ingress.yaml
 - ../canary/canary-preview-service.yaml
 - ../canary/canary-preview-ingress.yaml
+
+
+# Uncomment the following if you need to test analysis without traffic routing
+# Note that the canary service also needs to be added to the prometheus configuration, e.g.,
+# - job_name: rollouts-demo-preview
+#   scheme: http
+#   static_configs:
+#   - targets: ['canary-demo-preview.default.svc.cluster.local:80']
+# - rollout-with-analysis.yaml
+# - analysis-success-rate-local.yaml
+# - canary-demo-service.yaml
+# - canary-demo-preview-service.yaml
+
+# Uncomment the following to kustommize image
+# images:
+# - name: argoproj/rollouts-demo
+#   newName: new-image-name
+#   newTag: blue

examples/analysis/rollout-with-analysis.yaml

@@ -11,7 +11,8 @@ spec:
   strategy:
     canary:
       analysis:
-        templateName: success-rate
+        templates:
+        - templateName: success-rate-local
         args:
         - name: ingress
           value: canary-demo

go.mod

@@ -1,3 +1,5 @@
 module github.com/argoproj/rollouts-demo
 
-go 1.12
+go 1.16
+
+require github.com/prometheus/client_golang v1.11.0

go.sum

@@ -0,0 +1,138 @@
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+golang.org/x/sys v0.0.0-20210124154548-22da62e12c0c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 h1:JWgyZ1qgdTaF3N3oxC+MdTV7qvEEgHo3otj+HB5CM7Q=
+golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.26.0-rc.1 h1:7QnIQpGRHE5RnLKnESfDoxm2dTapTZua5a0kS0A+VXQ=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

main.go

@@ -15,6 +15,9 @@ import (
 	"strconv"
 	"syscall"
 	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 const (
@@ -41,6 +44,37 @@ var (
 	envErrorRate int
 )
 
+type responseWriter struct {
+	http.ResponseWriter
+	statusCode int
+}
+
+func NewResponseWriter(w http.ResponseWriter) *responseWriter {
+	return &responseWriter{w, http.StatusOK}
+}
+
+func (rw *responseWriter) WriteHeader(code int) {
+	rw.statusCode = code
+	rw.ResponseWriter.WriteHeader(code)
+}
+
+func prometheusMiddleware(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		log.Println("request:", r.RequestURI)
+		path := r.RequestURI
+
+		timer := prometheus.NewTimer(httpDuration.WithLabelValues(path))
+		defer timer.ObserveDuration()
+
+		rw := NewResponseWriter(w)
+		next.ServeHTTP(rw, r)
+
+		statusCode := rw.statusCode
+
+		totalRequests.WithLabelValues(path, strconv.Itoa(statusCode)).Inc()
+	})
+}
+
 func init() {
 	var err error
 	envLatencyStr := os.Getenv("LATENCY")
@@ -57,6 +91,8 @@ func init() {
 			panic(fmt.Sprintf("failed to parse ERROR_RATE: %s", envErrorRateStr))
 		}
 	}
+
+	prometheus.MustRegister(totalRequests)
 }
 
 func main() {
@@ -75,8 +111,16 @@ func main() {
 	rand.Seed(time.Now().UnixNano())
 
 	router := http.NewServeMux()
-	router.Handle("/", http.StripPrefix("/", http.FileServer(http.Dir("./"))))
-	router.HandleFunc("/color", getColor)
+
+	//router.Handle("/", http.StripPrefix("/", http.FileServer(http.Dir("./"))))
+
+	rootHandler := http.StripPrefix("/", http.FileServer(http.Dir("./")))
+	router.Handle("/", prometheusMiddleware(rootHandler))
+
+	colorHandler := http.HandlerFunc(getColor)
+	router.Handle("/color", prometheusMiddleware(colorHandler))
+
+	router.Handle("/metrics", promhttp.Handler())
 
 	server := &http.Server{
 		Addr:    listenAddr,

metrics.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+)
+
+var totalRequests = prometheus.NewCounterVec(
+	prometheus.CounterOpts{
+		Name: "http_requests_total",
+		Help: "Number of get requests.",
+	},
+	[]string{"path", "status"},
+)
+
+var httpDuration = promauto.NewHistogramVec(prometheus.HistogramOpts{
+	Name:    "http_response_time_seconds",
+	Help:    "Duration of HTTP requests.",
+	Buckets: []float64{0.01, 0.05, 0.1, 0.5},
+}, []string{"path"})