# Golang Sample Exporter 既然一个 exporter 就是将收集的数据转化为文本格式，并提供 http 请求即可，那很容自己实现一个。 ## 一个简单的 exporter 下面我将用 `golang` 实现一个简单的 `sample_exporter`, 其代码大致为： ```golang package main import ( "fmt" "net/http" ) func handler(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, exportData) } func main() { http.HandleFunc("/", handler) http.ListenAndServe(":8080", nil) } var exportData string = `# HELP sample_http_requests_total The total number of HTTP requests. # TYPE sample_http_requests_total counter sample_http_requests_total{method="post",code="200"} 1027 1395066363000 sample_http_requests_total{method="post",code="400"} 3 1395066363000 # Escaping in label values: sample_msdos_file_access_time_seconds{path="C:\\DIR\\FILE.TXT",error="Cannot find file:\n\"FILE.TXT\""} 1.458255915e9 # Minimalistic line: sample_metric_without_timestamp_and_labels 12.47 # A histogram, which has a pretty complex representation in the text format: # HELP sample_http_request_duration_seconds A histogram of the request duration. # TYPE sample_http_request_duration_seconds histogram sample_http_request_duration_seconds_bucket{le="0.05"} 24054 sample_http_request_duration_seconds_bucket{le="0.1"} 33444 sample_http_request_duration_seconds_bucket{le="0.2"} 100392 sample_http_request_duration_seconds_bucket{le="0.5"} 129389 sample_http_request_duration_seconds_bucket{le="1"} 133988 sample_http_request_duration_seconds_bucket{le="+Inf"} 144320 sample_http_request_duration_seconds_sum 53423 sample_http_request_duration_seconds_count 144320 # Finally a summary, which has a complex representation, too: # HELP sample_rpc_duration_seconds A summary of the RPC duration in seconds. # TYPE sample_rpc_duration_seconds summary sample_rpc_duration_seconds{quantile="0.01"} 3102 sample_rpc_duration_seconds{quantile="0.05"} 3272 sample_rpc_duration_seconds{quantile="0.5"} 4773 sample_rpc_duration_seconds{quantile="0.9"} 9001 sample_rpc_duration_seconds{quantile="0.99"} 76656 sample_rpc_duration_seconds_sum 1.7560473e+07 sample_rpc_duration_seconds_count 2693 ` ``` 当运行此程序，你访问 `http://localhost:8080/metrics`, 将看到这样的页面：  ## 与 Prometheus 集成 我们可以利用 Prometheus 的 static_configs 来收集 `sample_exporter` 的数据。 打开 `prometheus.yml` 文件, 在 `scrape_configs` 中添加如下配置： ``` - job_name: "sample" static_configs: - targets: ["127.0.0.1:8080"] ``` 重启加载配置，然后到 Prometheus Console 查询，你会看到 `simple_exporter` 的数据。