filter_log_to_metrics: Loosen the limit a count of label

Signed-off-by: Hiroshi Hatake <hiroshi@chronosphere.io>

Author: cosmo0920

plugins/filter_log_to_metrics/log_to_metrics.h

@@ -48,7 +48,7 @@
 #define NUMBER_OF_KUBERNETES_LABELS 5
 #define MAX_LABEL_LENGTH 253
 #define MAX_METRIC_LENGTH 253
-#define MAX_LABEL_COUNT 32
+#define MAX_LABEL_COUNT 128
 
 #define FLB_MEM_BUF_LIMIT_DEFAULT  "10M"
 #define DEFAULT_LOG_TO_METRICS_NAMESPACE "log_metric"