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Add Prometheus support for APK
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /* | ||
| * Copyright (c) 2024, WSO2 LLC. (https://www.wso2.com) | ||
| * | ||
| * WSO2 LLC. licenses this file to you under the Apache License, | ||
| * Version 2.0 (the "License"); you may not use this file except | ||
| * in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
|
|
||
| // Package metrics holds the implementation for exposing adapter metrics to prometheus | ||
| package metrics | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net/http" | ||
| "strconv" | ||
|
|
||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| xds "github.com/wso2/apk/adapter/internal/discovery/xds" | ||
| logger "github.com/wso2/apk/adapter/internal/loggers" | ||
| "github.com/wso2/apk/adapter/pkg/logging" | ||
| commonmetrics "github.com/wso2/apk/common-go-libs/pkg/metrics" | ||
| ) | ||
|
|
||
| var ( | ||
| prometheusMetricRegistry = prometheus.NewRegistry() | ||
| ) | ||
|
|
||
| // AdapterCollector contains the descriptions of the custom metrics exposed by the adapter. | ||
| // It also uses the metrics defined in common-go-libs | ||
| type AdapterCollector struct { | ||
| commonmetrics.Collector | ||
| apis *prometheus.Desc | ||
| internalClusterCount *prometheus.Desc | ||
| internalRouteCount *prometheus.Desc | ||
| } | ||
|
|
||
| func adapterMetricsCollector() *AdapterCollector { | ||
| return &AdapterCollector{ | ||
| Collector: *commonmetrics.CustomMetricsCollector(), | ||
| apis: prometheus.NewDesc( | ||
| "api_count", | ||
| "Number of APIs created.", | ||
| nil, nil, | ||
| ), | ||
| internalClusterCount: prometheus.NewDesc( | ||
| "internal_cluster_count", | ||
| "Number of internal clusters created.", | ||
| nil, nil, | ||
| ), | ||
| internalRouteCount: prometheus.NewDesc( | ||
| "internal_route_count", | ||
| "Number of internal routes created.", | ||
| nil, nil, | ||
| ), | ||
| } | ||
| } | ||
|
|
||
| // Describe sends all the descriptors of the metrics collected by this Collector | ||
| // to the provided channel. | ||
| func (collector *AdapterCollector) Describe(ch chan<- *prometheus.Desc) { | ||
| collector.Collector.Describe(ch) | ||
| ch <- collector.apis | ||
| ch <- collector.internalClusterCount | ||
| ch <- collector.internalRouteCount | ||
| } | ||
|
|
||
| // Collect collects all the relevant Prometheus metrics. | ||
| func (collector *AdapterCollector) Collect(ch chan<- prometheus.Metric) { | ||
| collector.Collector.Collect(ch) | ||
| var apisCount float64 | ||
| var internalClusterCount float64 | ||
| var internalRouteCount float64 | ||
|
|
||
| apiCount := xds.GetEnvoyInternalAPICount() | ||
| apisCount = float64(apiCount) | ||
|
|
||
| internalRouteCount = float64(xds.GetEnvoyInternalAPIRoutes()) | ||
| internalClusterCount = float64(xds.GetEnvoyInternalAPIClusters()) | ||
|
|
||
| ch <- prometheus.MustNewConstMetric(collector.apis, prometheus.GaugeValue, apisCount) | ||
| ch <- prometheus.MustNewConstMetric(collector.internalRouteCount, prometheus.GaugeValue, internalRouteCount) | ||
| ch <- prometheus.MustNewConstMetric(collector.internalClusterCount, prometheus.GaugeValue, internalClusterCount) | ||
| } | ||
|
|
||
| // StartPrometheusMetricsServer initializes and starts the metrics server to expose metrics to prometheus. | ||
| func StartPrometheusMetricsServer(port int32) { | ||
|
|
||
| collector := adapterMetricsCollector() | ||
| prometheus.MustRegister(collector) | ||
| http.Handle("/metrics", promhttp.Handler()) | ||
| err := http.ListenAndServe(":"+strconv.Itoa(int(port)), nil) | ||
| if err != nil { | ||
| logger.LoggerAPK.ErrorC(logging.ErrorDetails{ | ||
| Message: fmt.Sprintln("Prometheus metrics server error:", err), | ||
| Severity: logging.MAJOR, | ||
| ErrorCode: 1110, | ||
| }) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| /* | ||
| * Copyright (c) 2024, WSO2 LLC. (https://www.wso2.com) | ||
| * | ||
| * WSO2 LLC. licenses this file to you under the Apache License, | ||
| * Version 2.0 (the "License"); you may not use this file except | ||
| * in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, | ||
| * software distributed under the License is distributed on an | ||
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| * KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations | ||
| * under the License. | ||
| */ | ||
|
|
||
| package metrics | ||
|
|
||
| const ( | ||
| // PrometheusMetricType prometheus metric type | ||
| PrometheusMetricType = "prometheus" | ||
| ) |
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