Deprecate and remove configurable disk usage check (#6016)

cmd/disk-usage.go

@@ -18,56 +18,8 @@ package cmd
 
 import (
 	"context"
-	"encoding/json"
-	"fmt"
-	"time"
 )
 
-// Captures configurable parameters of usage check.
-type usageConfig struct {
-	UsageCheckInterval time.Duration
-}
-
-// MarshalJSON - encodes to JSON data.
-func (u usageConfig) MarshalJSON() ([]byte, error) {
-	type _usageConfig struct {
-		UsageCheckInterval string `json:"interval"`
-	}
-	return json.Marshal(_usageConfig{u.UsageCheckInterval.String()})
-}
-
-// parseDuration - parse duration string
-func parseDuration(dStr string) (time.Duration, error) {
-	d, err := time.ParseDuration(dStr)
-	if err != nil {
-		return d, err
-	}
-	if d < globalMinimumUsageCheckInterval {
-		return d, fmt.Errorf("interval %s is not allowed, minimum required value is %s",
-			d, globalMinimumUsageCheckInterval)
-	}
-	return d, nil
-}
-
-// UnmarshalJSON - decodes JSON data.
-func (u *usageConfig) UnmarshalJSON(data []byte) error {
-	type _usageConfig struct {
-		UsageCheckInterval string `json:"interval"`
-	}
-	var u1 = _usageConfig{}
-	if err := json.Unmarshal(data, &u1); err != nil {
-		return err
-	}
-	if !globalIsEnvUsageCheck {
-		d, err := parseDuration(u1.UsageCheckInterval)
-		if err != nil {
-			return err
-		}
-		u.UsageCheckInterval = d
-	}
-	return nil
-}
-
 // getDiskUsage walks the file tree rooted at root, calling usageFn
 // for each file or directory in the tree, including root.
 func getDiskUsage(ctx context.Context, root string, usageFn usageFunc) error {