Modify pika exporter

Author: YuCai18

tools/pika_exporter/exporter/metrics/bigkeys.go

@@ -37,7 +37,7 @@ var collectBigKeysMetrics = map[string]MetricConfig{
 		Parser: &regexParser{
 			name: "bigkeys_complex",
 			reg: regexp.MustCompile(
-				`Type: (?P<type>\w+), key: (?P<key>[^,]+), value_length: (?P<value_length>\d+), member_size: (?P<member_size>\d+)`,
+				`Type: (?P<type>\w+), key: (?P<key>[^,]+), key_length: (?P<key_length>\d+), member_size: (?P<member_size>\d+)`,
 			),
 		},
 		MetricMeta: MetaDatas{
@@ -49,11 +49,11 @@ var collectBigKeysMetrics = map[string]MetricConfig{
 				ValueName: "member_size",
 			},
 			{
-				Name:      "bigkeys_value_length",
-				Help:      "Big key value length",
+				Name:      "bigkeys_complex_key_length",
+				Help:      "Big key length for complex type",
 				Type:      metricTypeGauge,
 				Labels:    []string{LabelNameAddr, LabelNameAlias, "type", "key"},
-				ValueName: "value_length",
+				ValueName: "key_length",
 			},
 		},
 	},