chore: add proxy health interval flag/env config (#7919)

* chore: plumbing for proxy health interval from flag/env

codersdk/deployment.go

@@ -163,6 +163,7 @@ type DeploymentValues struct {
 	SSHConfig                       SSHConfig                       `json:"config_ssh,omitempty" typescript:",notnull"`
 	WgtunnelHost                    clibase.String                  `json:"wgtunnel_host,omitempty" typescript:",notnull"`
 	DisableOwnerWorkspaceExec       clibase.Bool                    `json:"disable_owner_workspace_exec,omitempty" typescript:",notnull"`
+	ProxyHealthStatusInterval       clibase.Duration                `json:"proxy_health_status_interval,omitempty" typescript:",notnull"`
 
 	Config      clibase.YAMLConfigPath `json:"config,omitempty" typescript:",notnull"`
 	WriteConfig clibase.Bool           `json:"write_config,omitempty" typescript:",notnull"`
@@ -1497,6 +1498,16 @@ Write out the current server config as YAML to stdout.`,
 			Default:     "", // empty string means pick best server
 			Hidden:      true,
 		},
+		{
+			Name:        "Proxy Health Check Interval",
+			Description: "The interval in which coderd should be checking the status of workspace proxies.",
+			Flag:        "proxy-health-interval",
+			Env:         "CODER_PROXY_HEALTH_INTERVAL",
+			Default:     (time.Minute).String(),
+			Value:       &c.ProxyHealthStatusInterval,
+			Group:       &deploymentGroupNetworkingHTTP,
+			YAML:        "proxyHealthInterval",
+		},
 	}
 	return opts
 }