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DCS Metrics

Table 1 DCS Redis metrics

Metric

Description

Value Range

Monitored Object

Monitoring Period (Raw Data)

CPU Usage

CPU consumed by the monitored object

Unit: Percent

0-100%

ECS

1 minute

Memory Usage

Memory consumed by the monitored object

Unit: Percent

0-100%

ECS

1 minute

Network Input Throughput

Inbound throughput per second on a port

Unit: byte/s

≥ 0 bytes/s

ECS

1 minute

Network Output Throughput

Outbound throughput per second on a port

Unit: byte/s

≥ 0 bytes/s

ECS

1 minute

Connected Clients

Number of connected clients, including connections established by the DCS server (a management service in the background) to monitor DCS instances and excluding connections from standby nodes

≥ 0

DCS

1 minute

Client Longest Output List

Longest output list of all client connections

≥ 0

DCS

1 minute

Client Biggest Input Buf

Maximum input data length among current client connections

Unit: byte

≥ 0 bytes

DCS

1 minute

Blocked Clients

Number of clients suspended by block operations, such as BLPOP, BRPOP, and BRPOPLPUSH

≥ 0

DCS

1 minute

Used Memory

Total number of bytes allocated by Redis using its allocator

Unit: byte

≥ 0 bytes

DCS

1 minute

Used Memory RSS

Number of dataset memory that the Redis server has used

That is, the memory that actually resides in the memory. It includes all stack and heap memory but not swapped-out memory.

Unit: byte

≥ 0 bytes

DCS

1 minute

Used Memory Peak

Peak memory consumed by Redis since the Redis server last started

Unit: byte

≥ 0 bytes

DCS

1 minute

Used Memory Lua

Number of bytes used by the Lua engine

Unit: byte

≥ 0 bytes

DCS

1 minute

Memory Fragmentation Ratio

Ratio between Used Memory RSS and Used Memory Its value is the same as that of used_memory_rss/used_memory. Ideally, the Used Memory RSS should be only slightly higher than Used Memory. When Used Memory RSS is much greater than Used Memory, there is memory fragmentation (internal or external), which can be evaluated by checking Memory Fragmentation Ratio. When Used Memory is much greater than Used Memory RSS, part of Redis memory has been swapped out by the operating system. In this case, significant latency can be expected. Because Redis does not have control over how its allocations are mapped to memory pages, high Used Memory RSS is often the result of a spike in memory usage.

≥ 0

DCS

1 minute

Total Connections Received

Total number of connections the Redis server has received since it last started, including connections established by the DCS server (a management service in the background) to monitor DCS instances

≥ 0

DCS

1 minute

Total Commands Processed

Total number of commands the Redis server has processed since it last started, including commands issued by the DCS server (a management service in the background) to monitor DCS instances

≥ 0

DCS

1 minute

Instantaneous Ops Per Second

Number of processed commands per second

≥ 0

DCS

1 minute

Total Net Input Bytes

Total number of bytes that the Redis server has received since it last started.

Unit: byte

≥ 0 bytes

DCS

1 minute

Total Net Output Bytes

Total number of bytes that the Redis server has sent since it last started

Unit: byte

≥ 0 bytes

DCS

1 minute

Instantaneous Input Kbps

Instantaneous input traffic

Unit: kbit/s

≥ 0 kb/s

DCS

1 minute

Instantaneous Output Kbps

Instantaneous output traffic

Unit: kbit/s

≥ 0 kb/s

DCS

1 minute

Rejected Connections

Number of connections that have exceeded maxclients and been rejected by the Redis server since it last started

≥ 0

DCS

1 minute

Sync Full

Total number of full synchronizations since the Redis server last started

≥ 0

DCS

1 minute

Sync Partial OK

Total number of successful incremental synchronizations since the Redis server last started

≥ 0

DCS

1 minute

Sync Partial Err

Total number of failed incremental synchronizations since the Redis server last started

≥ 0

DCS

1 minute

Expired Keys

Total number of keys that have expired since the Redis server last started

≥ 0

DCS

1 minute

Evicted Keys

Number of keys that have been evicted due to insufficient memory since the Redis server last started

≥ 0

DCS

1 minute

Keyspace Hits

Total number of successful lookups of keys in the main dictionary since the Redis server last started

≥ 0

DCS

1 minute

Keyspace Misses

Total number of failed lookups of keys in the main dictionary since the Redis server last started

≥ 0

DCS

1 minute

PubSub Channels

Number of Pub/Sub channels

≥ 0

DCS

1 minute

PubSub Patterns

Number of Pub/Sub patterns

≥ 0

DCS

1 minute

Aof Current Size

AOF file size

Unit: byte

≥ 0 bytes

DCS

1 minute

Latest Fork usec

Duration of the latest fork operation

Unit: ms

≥ 0 ms

DCS

1 minute