Proposal

When scratching jenkins http api metrics using basic auth, prometheus is working fine when filling in plain password text using password/password_file, but it is not secure to use plain password text in a config file, so are there any good ways to encrypt passwd text in config file?

Bug Report

Environment

• System information:
  CentOS 7.4 Linux 3.10.0-693.2.2.el7.x86_64 x86_64

• Prometheus version:
  prometheus, version 2.11.1 (branch: HEAD, revision: e5b2249)
  build user: root@d94406f2bb6f
  build date: 20190710-13:51:17
  go version: go1.12.7

``
insert configuration here (if relevant to the issue)

  - job_name: 'jenkins'
    metrics_path: /prometheus
    scheme: https
    basic_auth:
      username: "xxxx"
      password_file: "/var/lib/passwd"
    static_configs:
    - targets: ['xxxxxx']