Exclude master_replid fields from redis input (#3725)

plugins/inputs/redis/README.md

@@ -90,6 +90,7 @@ Additionally the plugin also calculates the hit/miss ratio (keyspace\_hitrate) a
     - master_link_down_since_seconds(int, number)
     - master_link_status(string)
     - master_repl_offset(int, number)
+    - second_repl_offset(int, number)
     - repl_backlog_active(int, number)
     - repl_backlog_size(int, bytes)
     - repl_backlog_first_byte_offset(int, number)

plugins/inputs/redis/redis.go

@@ -207,6 +207,10 @@ func gatherInfoOutput(
 			}
 		}
 
+		if strings.HasPrefix(name, "master_replid") {
+			continue
+		}
+
 		if name == "mem_allocator" {
 			continue
 		}

plugins/inputs/redis/redis_test.go

@@ -86,6 +86,7 @@ func TestRedis_ParseMetrics(t *testing.T) {
 		"repl_backlog_size":              int64(1048576),
 		"repl_backlog_first_byte_offset": int64(0),
 		"repl_backlog_histlen":           int64(0),
+		"second_repl_offset":             int64(-1),
 		"used_cpu_sys":                   float64(0.14),
 		"used_cpu_user":                  float64(0.05),
 		"used_cpu_sys_children":          float64(0.00),
@@ -189,7 +190,10 @@ latest_fork_usec:0
 # Replication
 role:master
 connected_slaves:0
+master_replid:8c4d7b768b26826825ceb20ff4a2c7c54616350b
+master_replid2:0000000000000000000000000000000000000000
 master_repl_offset:0
+second_repl_offset:-1
 repl_backlog_active:0
 repl_backlog_size:1048576
 repl_backlog_first_byte_offset:0