Revert "collector: add tasks API collection (prometheus-community#778)"

This reverts commit 7a98b17.

Author: jaimeyh

collector/cluster_info.go

@@ -77,7 +77,7 @@ type VersionInfo struct {
 	LuceneVersion semver.Version `json:"lucene_version"`
 }
 
-func (c *ClusterInfoCollector) Update(_ context.Context, ch chan<- prometheus.Metric) error {
+func (c *ClusterInfoCollector) Update(ctx context.Context, ch chan<- prometheus.Metric) error {
 	resp, err := c.hc.Get(c.u.String())
 	if err != nil {
 		return err

collector/cluster_settings_test.go

@@ -14,6 +14,7 @@
 package collector
 
 import (
+	"context"
 	"io"
 	"net/http"
 	"net/http/httptest"
@@ -23,9 +24,21 @@ import (
 	"testing"
 
 	"github.com/go-kit/log"
+	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/testutil"
 )
 
+type wrapCollector struct {
+	c Collector
+}
+
+func (w wrapCollector) Describe(ch chan<- *prometheus.Desc) {
+}
+
+func (w wrapCollector) Collect(ch chan<- prometheus.Metric) {
+	w.c.Update(context.Background(), ch)
+}
+
 func TestClusterSettingsStats(t *testing.T) {
 	// Testcases created using:
 	//  docker run -d -p 9200:9200 elasticsearch:VERSION-alpine

collector/collector_test.go

@@ -138,7 +138,7 @@ type basicAuth struct {
 	Next http.Handler
 }
 
-func (h *basicAuth) checkAuth(_ http.ResponseWriter, r *http.Request) bool {
+func (h *basicAuth) checkAuth(w http.ResponseWriter, r *http.Request) bool {
 	s := strings.SplitN(r.Header.Get("Authorization"), " ", 2)
 	if len(s) != 2 {
 		return false

collector/nodes_test.go

@@ -44,7 +44,7 @@ const (
 
 type mockES struct{}
 
-func (mockES) ServeHTTP(w http.ResponseWriter, _ *http.Request) {
+func (mockES) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 
 	fmt.Fprintf(w, `{
   "name" : "%s",