Pushover user_keys and tokens are visible

[joker234]

The config options Pushover user_key and Pushover token are visible on the status web page. They should be shown as <hidden> like hipchat_auth_token.

receivers:
- name: 'default'
  pushover_configs:
  - user_key: 'abcdefgh...'
    token: 'xyzabcde...'

I don't actually understand why they are not shown as <hidden>. The keys are marked as Secret in the PushoverConfig struct.

alertmanager/config/notifiers.go

Line 322 in 5158926

UserKey Secret `yaml:"user_key"`

[fabxc]

The Secret type was an idea that seemed good initially. Since the config file can get quite complex, it seemed to have an advantage to preserver comments and whitespaces by exposing the original file.

The <hidden> replacements simple happen via regular expressions, which don't cover the pushover names.