Update README

Signed-off-by: Markus Blaschke <mblaschke82@gmail.com>

Author: mblaschke

README.md

@@ -10,21 +10,27 @@ Prometheus exporter for PagerDuty informations (users, teams, schedules, oncalls
 Configuration
 -------------
 
-Normally no configuration is needed but can be customized using environment variables.
+```
+Usage:
+  pagerduty-exporter [OPTIONS]
+
+Application Options:
+  -v, --verbose                               Verbose mode [$VERBOSE]
+      --bind=                                 Server address (default: :8080) [$SERVER_BIND]
+      --scrape.time=                          Scrape time (time.duration) (default: 5m) [$SCRAPE_TIME]
+      --scrape.time.live=                     Scrape time incidents and oncalls (time.duration) (default: 1m) [$SCRAPE_TIME_LIVE]
+      --pagerduty.authtoken=                  PagerDuty auth token [$PAGERDUTY_AUTH_TOKEN]
+      --pagerduty.schedule.override-duration= PagerDuty timeframe for fetching schedule overrides (time.Duration) (default: 48h) [$PAGERDUTY_SCHEDULE_OVERRIDE_TIMEFRAME]
+      --pagerduty.schedule.entry-timeframe=   PagerDuty timeframe for fetching schedule entries (time.Duration) (default: 72h) [$PAGERDUTY_SCHEDULE_ENTRY_TIMEFRAME]
+      --pagerduty.schedule.entry-timeformat=  PagerDuty schedule entry time format (label) (default: Mon, 02 Jan 15:04 MST) [$PAGERDUTY_SCHEDULE_ENTRY_TIMEFORMAT]
+      --pagerduty.incident.timeformat=        PagerDuty incident time format (label) (default: Mon, 02 Jan 15:04 MST) [$PAGERDUTY_INCIDENT_TIMEFORMAT]
+      --pagerduty.disable-teams               Set to true to disable checking PagerDuty teams (for plans that don't include it) [$PAGERDUTY_DISABLE_TEAMS]
+      --pagerduty.team-filter=                Passes team ID as a list option when applicable. [$PAGERDUTY_TEAM_FILTER]
+      --pagerduty.max-connections=            Maximum numbers of TCP connections to PagerDuty API (concurrency) (default: 4) [$PAGERDUTY_MAX_CONNECTIONS]
 
-| Environment variable                   | DefaultValue                | Description                                                               |
-|-----------------------------------------|-----------------------------|--------------------------------------------------------------------------|
-| `SCRAPE_TIME`                           | `5m`                        | Time (time.Duration) for general informations                            |
-| `SCRAPE_TIME_LIVE`                      | `1m`                        | Time (time.Duration) for live metrics (incidents, oncall)                |
-| `SERVER_BIND`                           | `:8080`                     | IP/Port binding                                                          |
-| `PAGERDUTY_AUTH_TOKEN`                  | none                        | PagerDuty auth token                                                     |
-| `PAGERDUTY_SCHEDULE_OVERRIDE_TIMEFRAME` | `48h`                       | PagerDuty schedule override list timeframe                               |
-| `PAGERDUTY_SCHEDULE_ENTRY_TIMEFRAME`    | `72h`                       | PagerDuty schedule rendered list timeframe                               |
-| `PAGERDUTY_SCHEDULE_ENTRY_TIMEFORMAT`   | `Mon, 02 Jan 15:04 MST`     | PagerDuty schedule entry timeformat (label)                              |
-| `PAGERDUTY_INCIDENT_TIMEFORMAT`         | `Mon, 02 Jan 15:04 MST`     | PagerDuty incident entry timeformat (label)                              |
-| `PAGERDUTY_DISABLE_TEAMS`               | `false`                     | Boolean (set to 'true' to skip collecting "team" data)                   |
-| `PAGERDUTY_TEAM_FILTER`                 | none                        | Comma delimited list of Team IDs to pass to list options when applicable |
-| `PAGERDUTY_MAX_CONNECTIONS`             | `4`                         | Maximum numbers of HTTP connections to PagerDuty API                     |
+Help Options:
+  -h, --help                                  Show this help message
+```
 
 Metrics
 -------