})
		}

		if io.RChar > 0 {
			metrics = append(metrics,
				MetricV2{
					Description: getMinioProcessIOReadCachedBytesMD(),
					Value:       float64(io.RChar),
				})
		}

		if io.WChar > 0 {
			metrics = append(metrics,
				MetricV2{
					Description: getMinioProcessIOWriteCachedBytesMD(),
					Value:       float64(io.WChar),
				})
		}

            "uid": "${DS_PROMETHEUS}"
          },
          "exemplar": true,
          "expr": "rate(minio_node_io_rchar_bytes{job=~\"$scrape_jobs\"}[$__rate_interval])",
          "format": "time_series",
          "instant": false,
          "interval": "",
          "legendFormat": "Node RChar [{{server}}]",
          "refId": "A"
        },
        {
          "datasource": {

| `io_rchar_bytes`              | `counter` | Total bytes read by the process from the underlying storage system including cache, /proc/[pid]/io rchar       | `server` |
| `io_read_bytes`               | `counter` | Total bytes read by the process from the underlying storage system, /proc/[pid]/io read_bytes                  | `server` |

| `minio_node_io_rchar_bytes`                | Total bytes read by the process from the underlying storage system including cache, /proc/[pid]/io rchar.       |
| `minio_node_io_read_bytes`                 | Total bytes read by the process from the underlying storage system, /proc/[pid]/io read_bytes.                  |

	}
}

func loadProcIOMetrics(ctx context.Context, io procfs.ProcIO, m MetricValues) {
	if io.RChar > 0 {
		m.Set(processIORCharBytes, float64(io.RChar))
	}

	if io.ReadBytes > 0 {
		m.Set(processIOReadBytes, float64(io.ReadBytes))
	}

	if io.WChar > 0 {
		m.Set(processIOWCharBytes, float64(io.WChar))
	}

	if io.WriteBytes > 0 {
		m.Set(processIOWriteBytes, float64(io.WriteBytes))
	}

func TestNewRequestID(t *testing.T) {
	// Ensure that it returns an alphanumeric result of length 16.
	id := mustGetRequestID(UTCNow())

	if len(id) != 16 {
		t.Fail()
	}

	var e rune
	for _, char := range id {
		e = char

		// Ensure that it is alphanumeric, in this case, between 0-9 and A-Z.
		if !(('0' <= e && e <= '9') || ('A' <= e && e <= 'Z')) {
			t.Fail()
		}
	}

// arguments.
type SimpleArgFunc struct {
	FunctionName string `parser:" @(\"AVG\" | \"MAX\" | \"MIN\" | \"SUM\" |  \"COALESCE\" | \"NULLIF\" | \"TO_STRING\" | \"TO_TIMESTAMP\" | \"UTCNOW\" | \"CHAR_LENGTH\" | \"CHARACTER_LENGTH\" | \"LOWER\" | \"UPPER\") "`

	ArgsList []*Expression `parser:"\"(\" (@@ (\",\" @@)*)?\")\""`
}

// CountFunc represents the COUNT sql function
type CountFunc struct {

	sqlFnExtract     FuncName = "EXTRACT"
	sqlFnToString    FuncName = "TO_STRING"
	sqlFnToTimestamp FuncName = "TO_TIMESTAMP"
	sqlFnUTCNow      FuncName = "UTCNOW"

	// String
	sqlFnCharLength      FuncName = "CHAR_LENGTH"
	sqlFnCharacterLength FuncName = "CHARACTER_LENGTH"
	sqlFnLower           FuncName = "LOWER"
	sqlFnSubstring       FuncName = "SUBSTRING"
	sqlFnTrim            FuncName = "TRIM"
	sqlFnUpper           FuncName = "UPPER"

)

const (
	mysqlTableExists = `SELECT 1 FROM %s;`
	// Some MySQL has a 3072 byte limit on key sizes.
	mysqlCreateNamespaceTable = `CREATE TABLE %s (
             key_name VARCHAR(3072) NOT NULL,
             key_hash CHAR(64) GENERATED ALWAYS AS (SHA2(key_name, 256)) STORED NOT NULL PRIMARY KEY,
             value JSON)
           CHARACTER SET = utf8mb4 COLLATE = utf8mb4_bin ROW_FORMAT = Dynamic;`