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| // Copyright 2022 The Prometheus Authors | ||
| // Licensed 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. | ||
|
|
||
| // A minimal example of how to include Prometheus instrumentation for database stats. | ||
| package main | ||
|
|
||
| import ( | ||
| "database/sql" | ||
| "flag" | ||
| "fmt" | ||
| "log" | ||
| "net/http" | ||
| "time" | ||
|
|
||
| _ "github.com/mattn/go-sqlite3" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/collectors" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| ) | ||
|
|
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| var addr = flag.String("listen-address", ":8080", "The address to listen on for HTTP requests.") | ||
|
|
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| func main() { | ||
| flag.Parse() | ||
|
|
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| // Set up an in-memory SQLite DB. | ||
| db, err := sql.Open("sqlite3", ":memory:") // In-memory SQLite database | ||
| if err != nil { | ||
| log.Fatalf("Failed to connect to in-memory database: %v", err) | ||
| } | ||
| defer db.Close() | ||
|
|
||
| // Set connection pool limits to simulate more activity. | ||
| db.SetMaxOpenConns(10) | ||
| db.SetMaxIdleConns(5) | ||
| db.SetConnMaxIdleTime(5 * time.Minute) | ||
| db.SetConnMaxLifetime(30 * time.Minute) | ||
|
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| // Create a new Prometheus registry. | ||
| reg := prometheus.NewRegistry() | ||
|
|
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| // Create and register the DB stats collector. | ||
| dbStatsCollector := collectors.NewDBStatsCollector(db, "sqlite_in_memory") | ||
| reg.MustRegister(dbStatsCollector) | ||
|
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| // Expose the registered metrics via HTTP. | ||
| http.Handle("/metrics", promhttp.HandlerFor( | ||
| reg, | ||
| promhttp.HandlerOpts{}, | ||
| )) | ||
|
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| fmt.Println("Server is running, metrics are available at /metrics") | ||
| log.Fatal(http.ListenAndServe(*addr, nil)) | ||
| } |
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