CLI Flags

CLI flags take precedence over environment variables.

Flag	Environment variable	Default	Description
`-config`	`ICAL_FILTER_PROXY_CONFIG`	`config.yaml`	Config file path.
`-address`	`ICAL_FILTER_PROXY_ADDRESS`	`:8080`	Public calendar listener address.
`-management-address`	`ICAL_FILTER_PROXY_MANAGEMENT_ADDRESS`	empty	Optional management listener address for liveness, readiness, and metrics.
`-debug`	`ICAL_FILTER_PROXY_DEBUG`	`false`	Enable debug logging.
`-json`	`ICAL_FILTER_PROXY_JSON`	`false`	Emit logs as JSON.
`-validate`	`ICAL_FILTER_PROXY_VALIDATE`	`false`	Validate config and exit.
`-metrics`	`ICAL_FILTER_PROXY_METRICS`	`false`	Enable Prometheus metrics.
`-metrics-calendar-labels`	`ICAL_FILTER_PROXY_METRICS_CALENDAR_LABELS`	`false`	Enable per-calendar metric labels.
`-trusted-proxy-cidr`	`ICAL_FILTER_PROXY_TRUSTED_PROXY_CIDRS`	empty	Trusted reverse proxy CIDR for forwarded client addresses. The flag may be repeated; the environment variable is comma-separated.
`-version`	none	`false`	Print version and exit.

Boolean environment variables use Go boolean parsing.