# Deployment glossary

| Term | Meaning |
|---|---|
| Alert rule | A threshold on one resource metric for one target. Firings appear in the environment; they are not sent externally. See [metrics and alerts](/ship/deployment/metrics). |
| Base domain | A domain registered for a product, available when connecting a root hostname or subdomain. See [domains](/ship/deployment/domains). |
| Build | Converts repository code into a container image or static output. Prebuilt images and rollbacks skip this step. See [deployments](/ship/deployment/deploy). |
| Build log | Output attached to a deployment's build, streamed while building and readable afterward. See [logs](/ship/deployment/observability). |
| Custom domain | Your own hostname connected to services in one environment through DNS records and routes. See [domains](/ship/deployment/domains). |
| Default route | The required `/` route on a custom domain. It handles requests without a more specific route. See [routes](/ship/deployment/domains#route-paths-to-different-services). |
| Deployment | A release of one service, recording its image or files and resolved configuration. At most one is active. See [deployments](/ship/deployment/deploy). |
| Environment | Services and related resources grouped within a product, with their own private network. See [environments](/ship/deployment/environments). |
| Environment canvas | The environment view with service, database and volume nodes. Selecting a node opens its panel. See [the deployment model](/ship/deployment). |
| Event | Lepsto's timestamped record of an operation or resource state change. See [events](/ship/deployment/observability). |
| Fork | A one-time copy of environment configuration, without secrets, custom domains, data or deployment history. See [environments](/ship/deployment/environments). |
| Generated domain | The service's default `lepsto.run` hostname, with a fixed route to that service. See [domains](/ship/deployment/domains). |
| Health check | An optional HTTP probe for readiness or liveness. See [health checks](/ship/deployment/scaling#configure-health-checks). |
| Liveness check | A probe that restarts a running replica when it stops responding. See [scaling](/ship/deployment/scaling). |
| Log level | `error`, `warn`, `info` or `debug`, derived from structured output or message text. See [logs](/ship/deployment/observability). |
| Managed database | A database operated by Lepsto, either within one environment or through Managed Postgres. See [databases](/ship/deployment/databases). |
| Managed Postgres | Product-level Postgres instances containing logical databases attachable across environments. See [Managed Postgres](/ship/deployment/databases#managed-postgres). |
| Managed service | An environment-managed PostgreSQL, MySQL, Redis or MongoDB database with private connection variables. See [databases](/ship/deployment/databases). |
| Mount path | The absolute container path where a volume appears, chosen at volume creation. See [volumes](/ship/deployment/volumes). |
| One-off command | A non-interactive command that returns output and an exit code, run in a replica or separate container. See [commands](/ship/deployment/terminal). |
| Preview environment | A pull-request fork that redeploys on commits and expires after closure or inactivity. See [previews](/ship/deployment/environments). |
| Preview policy | A base environment's settings for enabling previews, their maximum count and lifetime. See [previews](/ship/deployment/environments). |
| Product | The owner of deployment environments and product-level resources, including Managed Postgres. See [the deployment model](/ship/deployment). |
| Readiness check | A probe controlling whether a replica can receive traffic and a new release can become active. See [scaling](/ship/deployment/scaling). |
| Redeploy | A new deployment from current source and variables, without needing a new commit. See [deployments](/ship/deployment/deploy). |
| Release | Another name for a deployment. See [deployments](/ship/deployment/deploy). |
| Replica | One running copy of a service's current release. Requests can reach different replicas. See [scaling](/ship/deployment/scaling). |
| Restart | Starts the same runtime image again without a build or new deployment entry. See [deployments](/ship/deployment/deploy). |
| Rollback | Creates a new deployment from an earlier image with current variables. See [rollback](/ship/deployment/deploy). |
| Route | A custom-domain path prefix mapped to a service in the same environment. See [routes](/ship/deployment/domains#route-paths-to-different-services). |
| Runtime log | Output a container writes to stdout/stderr. Static sites have none. See [logs](/ship/deployment/observability). |
| Scale to zero | Opt-in sleep after an idle window, with startup triggered by a request or explicit wake. See [scaling](/ship/deployment/scaling). |
| Secret | An encrypted, write-only variable whose old value cannot be listed. See [variables](/ship/deployment/variables). |
| Separate run | A temporary container from a service's current image and variables for a one-off command. See [commands](/ship/deployment/terminal). |
| Service | A deployable unit with a source, settings and deployment history in one environment. See [services](/ship/deployment/services). |
| Service source | Repository, image or static archive used to build or publish the service. See [sources](/ship/deployment/services#1-choose-the-source). |
| Service type | Runtime container or static site; the type determines sources and available settings. See [services](/ship/deployment/services). |
| Slug | A short resource identifier, unique within its containing scope. Environment slugs remain fixed after creation. See [environments](/ship/deployment/environments). |
| Snapshot | A release's captured source and resolved variables, or a database backup's stored contents; the context distinguishes them. See [deployments](/ship/deployment/deploy) and [database backups](/ship/deployment/databases#back-up-and-restore). |
| SSH key | A public key registered for the product so your SSH client can enter a running replica. See [SSH](/ship/deployment/terminal#connect-through-ssh). |
| Static site | Built files served without a long-running application container. See [static sites](/ship/deployment/services#static-serving-options). |
| Terminal | An interactive browser shell inside a running replica. See [commands](/ship/deployment/terminal). |
| Variable | Named configuration inherited from product, environment and service levels. See [variables](/ship/deployment/variables). |
| Variable reference | `${{KEY}}` or `${{slug.KEY}}` resolved into a variable value when a deployment starts. See [references](/ship/deployment/variables#3-add-references-if-needed). |
| Volume | Persistent disk mounted into one service. It survives container replacement and requires an interrupted rollout. See [volumes](/ship/deployment/volumes). |
| Wake | Start a sleeping service on its existing release, through a request or an explicit action. See [scaling](/ship/deployment/scaling#sleep-when-idle). |