如何在Prometheus中启用某些特定指标？

Question

我对以下指标感兴趣：

1. 请求总数（特别是成功/ failure / abort / exception）
2. 平均请求延迟
3. 第99个百分位请求延迟

默认情况下（/metrics），我只能看到以下指标：

# HELP process_cpu_user_seconds_total Total user CPU time spent in seconds.
# TYPE process_cpu_user_seconds_total counter
process_cpu_user_seconds_total 0.001169 1564521899909

# HELP process_cpu_system_seconds_total Total system CPU time spent in seconds.
# TYPE process_cpu_system_seconds_total counter
process_cpu_system_seconds_total 0.000042 1564521899909

# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 0.001211 1564521899909

# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1564521900
...

我是否必须自己实现其他功能（例如，使用Histogram）？如果是，那么是否有一些受欢迎的实现得到批准？