Add mem_shared metric to CloudWatch Agent (#1792)

Co-authored-by: Ola Amr <[email protected]>

Author: ola-amr

receiver/adapter/accumulator/default_unit.go

@@ -75,6 +75,7 @@ var defaultUnits = map[string]map[string]string{
 		"buffered":          "Bytes",
 		"active":            "Bytes",
 		"inactive":          "Bytes",
+		"shared":            "Bytes",
 		"available_percent": "Percent",
 		"used_percent":      "Percent",
 	},

translator/config/sampleSchema/validLinuxMetrics.json

@@ -62,6 +62,7 @@
         "measurement": [
           "mem_used",
           "mem_cached",
+          "mem_shared",
           "mem_total"
         ],
         "metrics_collection_interval": 1

translator/translate/metrics/config/registered_metrics.go

@@ -13,7 +13,7 @@ var Registered_Metrics_Linux = map[string][]string{
 		"ebs_total_read_bytes", "ebs_total_write_bytes", "ebs_total_read_time", "ebs_total_write_time", "ebs_volume_performance_exceeded_iops",
 		"ebs_volume_performance_exceeded_tp", "ebs_ec2_instance_performance_exceeded_iops", "ebs_ec2_instance_performance_exceeded_tp", "ebs_volume_queue_length"},
 	"swap":      {"free", "used", "used_percent"},
-	"mem":       {"active", "available", "available_percent", "buffered", "cached", "free", "inactive", "total", "used", "used_percent"},
+	"mem":       {"active", "available", "available_percent", "buffered", "cached", "free", "inactive", "shared", "total", "used", "used_percent"},
 	"net":       {"bytes_sent", "bytes_recv", "drop_in", "drop_out", "err_in", "err_out", "packets_sent", "packets_recv"},
 	"netstat":   {"tcp_close", "tcp_close_wait", "tcp_closing", "tcp_established", "tcp_fin_wait1", "tcp_fin_wait2", "tcp_last_ack", "tcp_listen", "tcp_none", "tcp_syn_sent", "tcp_syn_recv", "tcp_time_wait", "udp_socket"},
 	"processes": {"blocked", "dead", "idle", "paging", "running", "sleeping", "stopped", "total", "total_threads", "wait", "zombies"},