| `KLAR_TRACE` | Set to true to enable more verbose output from klar. | `"false"` |
| `CLAIR_TRACE` | Set to true to enable more verbose output from the clair server process. | `"false"` |
| `DOCKER_USER` | Username for accessing a Docker registry requiring authentication. | `$CI_REGISTRY_USER` |
| `DOCKER_PASSWORD` | Password for accessing a Docker registry requiring authentication. | `$CI_REGISTRY_PASSWORD` |
| `CLAIR_OUTPUT` | Severity level threshold. Vulnerabilities with severity level higher than or equal to this threshold will be outputted. Supported levels are `Unknown`, `Negligible`, `Low`, `Medium`, `High`, `Critical` and `Defcon1`. | `Unknown` |