feat(inptus.elasticsearch): Gather enrich stats

plugins/inputs/elasticsearch/README.md

@@ -74,6 +74,9 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   ## To work this require local = true
   cluster_stats_only_from_master = true
 
+  ## Gather stats from the enrich API
+  # enrich_stats = false
+
   ## Indices to collect; can be one or more indices names or _all
   ## Use of wildcards is allowed. Use a wildcard at the end to retrieve index
   ## names that end with a changing value, like a date.
@@ -98,7 +101,7 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   # tls_key = "/etc/telegraf/key.pem"
   ## Use TLS but skip chain & host verification
   # insecure_skip_verify = false
- 
+
   ## If 'use_system_proxy' is set to true, Telegraf will check env vars such as
   ## HTTP_PROXY, HTTPS_PROXY, and NO_PROXY (or their lowercase counterparts).
   ## If 'use_system_proxy' is set to false (default) and 'http_proxy_url' is

plugins/inputs/elasticsearch/elasticsearch.go

@@ -68,6 +68,23 @@ type clusterHealth struct {
 	Indices                     map[string]indexHealth `json:"indices"`
 }
 
+type enrichStats struct {
+	CoordinatorStats []struct {
+		NodeID                string `json:"node_id"`
+		QueueSize             int    `json:"queue_size"`
+		RemoteRequestsCurrent int    `json:"remote_requests_current"`
+		RemoteRequestsTotal   int    `json:"remote_requests_total"`
+		ExecutedSearchesTotal int    `json:"executed_searches_total"`
+	} `json:"coordinator_stats"`
+	CacheStats []struct {
+		NodeID    string `json:"node_id"`
+		Count     int    `json:"count"`
+		Hits      int64  `json:"hits"`
+		Misses    int    `json:"misses"`
+		Evictions int    `json:"evictions"`
+	} `json:"cache_stats"`
+}
+
 type indexHealth struct {
 	ActivePrimaryShards int    `json:"active_primary_shards"`
 	ActiveShards        int    `json:"active_shards"`
@@ -104,6 +121,7 @@ type Elasticsearch struct {
 	ClusterHealthLevel         string            `toml:"cluster_health_level"`
 	ClusterStats               bool              `toml:"cluster_stats"`
 	ClusterStatsOnlyFromMaster bool              `toml:"cluster_stats_only_from_master"`
+	EnrichStats                bool              `toml:"enrich_stats"`
 	IndicesInclude             []string          `toml:"indices_include"`
 	IndicesLevel               string            `toml:"indices_level"`
 	NodeStats                  []string          `toml:"node_stats"`
@@ -280,6 +298,13 @@ func (e *Elasticsearch) Gather(acc telegraf.Accumulator) error {
 					}
 				}
 			}
+
+			if e.EnrichStats {
+				if err := e.gatherEnrichStats(s+"/_enrich/_stats", acc); err != nil {
+					acc.AddError(errors.New(mask.ReplaceAllString(err.Error(), "http(s)://XXX:XXX@")))
+					return
+				}
+			}
 		}(serv, acc)
 	}
 
@@ -440,6 +465,46 @@ func (e *Elasticsearch) gatherClusterHealth(url string, acc telegraf.Accumulator
 	return nil
 }
 
+func (e *Elasticsearch) gatherEnrichStats(url string, acc telegraf.Accumulator) error {
+	enrichStats := &enrichStats{}
+	if err := e.gatherJSONData(url, enrichStats); err != nil {
+		return err
+	}
+	measurementTime := time.Now()
+
+	for _, coordinator := range enrichStats.CoordinatorStats {
+		coordinatorFields := map[string]interface{}{
+			"queue_size":              coordinator.QueueSize,
+			"remote_requests_current": coordinator.RemoteRequestsCurrent,
+			"remote_requests_total":   coordinator.RemoteRequestsTotal,
+			"executed_searches_total": coordinator.ExecutedSearchesTotal,
+		}
+		acc.AddFields(
+			"elasticsearch_enrich_stats_coordinator",
+			coordinatorFields,
+			map[string]string{"node_id": coordinator.NodeID},
+			measurementTime,
+		)
+	}
+
+	for _, cache := range enrichStats.CacheStats {
+		cacheFields := map[string]interface{}{
+			"count":     cache.Count,
+			"hits":      cache.Hits,
+			"misses":    cache.Misses,
+			"evictions": cache.Evictions,
+		}
+		acc.AddFields(
+			"elasticsearch_enrich_stats_cache",
+			cacheFields,
+			map[string]string{"node_id": cache.NodeID},
+			measurementTime,
+		)
+	}
+
+	return nil
+}
+
 func (e *Elasticsearch) gatherClusterStats(url string, acc telegraf.Accumulator) error {
 	clusterStats := &clusterStats{}
 	if err := e.gatherJSONData(url, clusterStats); err != nil {

plugins/inputs/elasticsearch/elasticsearch_test.go

@@ -100,6 +100,22 @@ func TestGatherIndividualStats(t *testing.T) {
 	acc.AssertDoesNotContainsTaggedFields(t, "elasticsearch_breakers", nodestatsBreakersExpected, tags)
 }
 
+func TestGatherEnrichStats(t *testing.T) {
+	es := newElasticsearchWithClient()
+	es.Servers = []string{"http://example.com:9200"}
+	es.EnrichStats = true
+	es.client.Transport = newTransportMock(enrichStatsResponse)
+	es.serverInfo = make(map[string]serverInfo)
+	es.serverInfo["http://example.com:9200"] = defaultServerInfo()
+
+	var acc testutil.Accumulator
+	require.NoError(t, acc.GatherError(es.Gather))
+	require.False(t, es.serverInfo[es.Servers[0]].isMaster(), "IsMaster set incorrectly")
+
+	metrics := acc.GetTelegrafMetrics()
+	require.Len(t, metrics, 8)
+}
+
 func TestGatherNodeStats(t *testing.T) {
 	es := newElasticsearchWithClient()
 	es.Servers = []string{"http://example.com:9200"}

plugins/inputs/elasticsearch/sample.conf

@@ -33,6 +33,9 @@
   ## To work this require local = true
   cluster_stats_only_from_master = true
 
+  ## Gather stats from the enrich API
+  # enrich_stats = false
+
   ## Indices to collect; can be one or more indices names or _all
   ## Use of wildcards is allowed. Use a wildcard at the end to retrieve index
   ## names that end with a changing value, like a date.
@@ -57,7 +60,7 @@
   # tls_key = "/etc/telegraf/key.pem"
   ## Use TLS but skip chain & host verification
   # insecure_skip_verify = false
- 
+
   ## If 'use_system_proxy' is set to true, Telegraf will check env vars such as
   ## HTTP_PROXY, HTTPS_PROXY, and NO_PROXY (or their lowercase counterparts).
   ## If 'use_system_proxy' is set to false (default) and 'http_proxy_url' is

plugins/inputs/elasticsearch/testdata_test.go

@@ -62,6 +62,72 @@ const clusterHealthResponseWithIndices = `
 }
 `
 
+const enrichStatsResponse = `
+{
+  "executing_policies": [],
+  "coordinator_stats": [
+    {
+      "node_id": "RWkDKDRu_aV1fISRA7PIkg",
+      "queue_size": 0,
+      "remote_requests_current": 0,
+      "remote_requests_total": 101636700,
+      "executed_searches_total": 102230925
+    },
+    {
+      "node_id": "2BOvel8nrXRjmSMAMBSUp3",
+      "queue_size": 0,
+      "remote_requests_current": 0,
+      "remote_requests_total": 242051423,
+      "executed_searches_total": 242752071
+    },
+    {
+      "node_id": "smkOUPQOK1pymt8MCoglZJ",
+      "queue_size": 0,
+      "remote_requests_current": 0,
+      "remote_requests_total": 248009084,
+      "executed_searches_total": 248735550
+    },
+    {
+      "node_id": "g5EUAaS-6-z5w27OtGQeTI",
+      "queue_size": 0,
+      "remote_requests_current": 0,
+      "remote_requests_total": 233693129,
+      "executed_searches_total": 234476004
+    }
+  ],
+  "cache_stats": [
+    {
+      "node_id": "RWkDKDRu_aV1fISRA7PIkg",
+      "count": 2500,
+      "hits": 6044497858,
+      "misses": 102230925,
+      "evictions": 92663663
+    },
+    {
+      "node_id": "2BOvel8nrXRjmSMAMBSUp3",
+      "count": 2500,
+      "hits": 14640821136,
+      "misses": 242752071,
+      "evictions": 226826313
+    },
+    {
+      "node_id": "smkOUPQOK1pymt8MCoglZJ",
+      "count": 2500,
+      "hits": 14145580115,
+      "misses": 248735550,
+      "evictions": 233860968
+    },
+    {
+      "node_id": "g5EUAaS-6-z5w27OtGQeTI",
+      "count": 2500,
+      "hits": 11016000946,
+      "misses": 234476004,
+      "evictions": 217698127
+    }
+  ]
+}
+`
+
 var clusterHealthExpected = map[string]interface{}{
 	"status":                           "green",
 	"status_code":                      1,