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+# Environment Variables
+
+This document outlines the set of environment variables that can be used to customize the behaviours at different levels.
+These environment variables are typically added to test out experimental features and should not be needed by most users.
+Note that these environment variables may be removed at any time.
+
+## Controller
+
+| Name | Type | Description|
+|----------|------|------------|
+| `ALL_POD_CHANGES_SIGNIFICANT` | `bool` |  Whether to consider all pod changes as significant during pod reconciliation. |
+| `ALWAYS_OFFLOAD_NODE_STATUS` | `bool` | Whether to always offload the node status. |
+| `ARCHIVED_WORKFLOW_GC_PERIOD` | `time.Duration` | The periodicity for GC of archived workflows. |
+| `ARGO_TRACE` | `bool` | Whether to enable tracing statements in Argo components. |
+| `DEFAULT_REQUEUE_TIME` | `time.Duration` | The requeue time for the rate limiter of the workflow queue. |
+| `LEADER_ELECTION_IDENTITY` | `string` | The ID used for workflow controllers to elect a leader. |
+| `MAX_OPERATION_TIME` | `time.Duration` | The maximum time a workflow operation is allowed to run for before requeuing the workflow onto the work queue. |
+| `OFFLOAD_NODE_STATUS_TTL` | `time.Duration` | The TTL to delete the offloaded node status. Currently only used for testing. |
+| `RECENTLY_STARTED_POD_DURATION` | `time.Duration` | The duration of a pod before the pod is considered to be recently started. |
+| `RETRY_BACKOFF_DURATION` | `time.Duration` | The retry backoff duration when retrying API calls. |
+| `RETRY_BACKOFF_FACTOR` | `float` | The retry backoff factor when retrying API calls. |
+| `RETRY_BACKOFF_STEPS` | `int` | The retry backoff steps when retrying API calls. |
+| `TRANSIENT_ERROR_PATTERN` | `string` | The regular expression that represents additional patterns for transient errors. |
+| `WF_DEL_PROPAGATION_POLICY` | `string` | The deletion propogation policy for workflows. |
+| `WORKFLOW_GC_PERIOD` | `time.Duration` | The periodicity for GC of workflows. |
+
+## Executor
+
+| Name | Type | Description|
+|----------|------|------------|
+| `ARGO_CONTAINER_RUNTIME_EXECUTOR` | `string` | The name of the container runtime executor. |
+| `ARGO_KUBELET_PORT` | `int` | The port to the Kubelet API. |
+| `ARGO_KUBELET_INSECURE` | `bool` | Whether to disable the TLS verification. |
+| `PNS_PRIVILEGED` | `bool` | Whether to always set privileged on for PNS when PNS executor is used. |
+| `REMOVE_LOCAL_ART_PATH` | `bool` | Whether to remove local artifacts. |