Help Center/ GeminiDB/ GeminiDB Cassandra API/ Working with GeminiDB Cassandra API/ Viewing Metrics and Configuring Alarms/ Supported Metrics
Updated on 2025-10-29 GMT+08:00
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Supported Metrics

This section describes GeminiDB Cassandra API metrics reported to Cloud Eye as well as their namespaces and dimensions. You can use APIs provided by Cloud Eye to query the metrics and alarms.

Cloud Eye can monitor dimensions (or objects) nested to a maximum depth of four levels (levels 0 to 3). 3 is the deepest level. For example, if the monitored dimension of a metric is cassandra_cluster_id,cassandra_node_id, cassandra_cluster_id indicates level 0 and cassandra_node_id indicates level 1.

Namespace

SYS.NoSQL

Metrics

You can view metrics on instance nodes by referring to Viewing Metrics.

Table 1 GeminiDB Cassandra API metrics

Metric ID

Name

Description

Value Range

Unit

Number System

Dimension

Monitoring Period (Raw Data)

nosql005_disk_usage

Storage Space Usage

Storage usage of the current instance.

0–100

%

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

nosql006_disk_total_size

Total Storage Space

Total storage space of the current instance.

≥ 0

GB

1024(IEC)

cassandra_cluster_id,cassandra_node_id

1 minute

nosql007_disk_used_size

Storage Space Usage

Storage space usage of the current instance.

≥ 0

GB

1024(IEC)

cassandra_cluster_id,cassandra_node_id

1 minute

nosql009_dfv_write_delay

Storage Write Latency

Average delay of writing data to the storage layer in a specified period

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

nosql010_dfv_read_delay

Storage Read Latency

Average latency of reading data from the storage layer in a specified period

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra001_cpu_usage

CPU Usage

CPU usage of an instance

0–100

%

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra002_mem_usage

Memory Usage

Memory usage of the instance

0–100

%

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra003_bytes_out

Network Output Throughput

Outgoing traffic in bytes per second

≥ 0 Bytes/s

Bytes/s

1024(IEC)

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra004_bytes_in

Network Input Throughput

Incoming traffic in bytes per second

≥ 0

Bytes/s

1024(IEC)

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra014_connections

Active Node Connections

Total number of connections attempting to connect to Cassandra instance nodes

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra015_read_latency

Average Read Latency

Average amount of time consumed by read requests

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra016_write_latency

Average Write Latency

Average amount of time consumed by write requests

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra037_pending_write

Suspended Write Tasks

Number of write tasks waiting in the queue

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra038_pending_read

Suspended Read Tasks

Number of read tasks waiting in the queue.

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra044_range_slice_latency

Scan Duration

Average time consumed by scan operations

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra049_dropped_mutation

Dropped Writes

Average number of dropped writes

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra052_dropped_read

Dropped Reads

Average number of dropped reads

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra092_load_info

Data Volume on a Node

Data volume on a node

≥ 0

Byte

1024(IEC)

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra093_write_count_latency

Accumulated Write Requests

Number of write requests initiated by a node

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra094_write_1min_rate

Average Write Rate in the Last Minute

Average write rate in the last minute

≥ 0

Counts/s

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra095_write_p75_latency

p75 Write Latency

p75 write latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra096_write_p95_latency

p95 Write Latency

p95 write latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra097_write_p99_latency

p99 Write Latency

p99 write latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra098_read_count_latency

Accumulated Read Requests

Number of read requests initiated by a node

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra099_read_1min_rate

Average Read Rate in the Last Minute

Average read rate in the last minute

≥ 0

Counts/s

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra100_read_p75_latency

p75 Read Latency

p75 read latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra101_read_p95_latency

p95 Read Latency

p95 read latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra102_read_p99_latency

p99 Read Latency

p99 read latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra103_range_slice_count_latency

Accumulated Range Read Requests

Number of range read requests

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra104_range_slice_1min_rate

Average Range Read Rate in the Last Minute

Average range read rate in the last minute

≥ 0

Counts/s

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra105_range_slice_p75_latency

p75 Range Read Latency

p75 range read latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra106_range_slice_p95_latency

p95 Range Read Latency

p95 range read latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra107_range_slice_p99_latency

p99 Range Read Latency

p99 range read latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra163_write_p999_latency

p999 Write Latency

p999 write latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra164_read_p999_latency

p999 Read Latency

p999 read latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra165_large_partition_num

Big Keys

Number of big keys on the current node

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra166_write_max_latency

Maximum Write Latency

Maximum write latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra167_read_max_latency

Maximum Read Latency

Maximum read latency

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra168_imbalance_table_num

Tables with Uneven Data Distribution

Number of tables whose data is not evenly distributed

≥ 0

Counts

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra169_modify_request_size_mean

Average Write Request Size

Average write request size

≥ 0

Bytes

1024(IEC)

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra170_query_response_size_mean

Average Query Response Size

Average size of query requests

≥ 0 Bytes

Bytes

1024(IEC)

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra173_limit_diff_count_mean

Mean of limit Value and Returned Rows

Mean of limit difference

≥ 0

-

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra174_tombstone_query_rate

Tombstone Query Requests per Second

Rate of tombstone query requests

≥ 0

Counts/s

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra175_max_sync_delay

maximum disaster backup instance sync delay

Maximum synchronization delay in case of disaster recovery

≥ 0

ms

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra175_single_delete_rate

Row Delete Requests per Second

Rate at which a single row is deleted

≥ 0

Counts/s

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra176_range_delete_rate

Range Delete Requests per Second

Range deletion rate

≥ 0

Counts/s

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

cassandra177_large_row_count

Large Rows per Second

Number of large rows

≥ 0

Counts/s

N/A

cassandra_cluster_id,cassandra_node_id

1 minute

If an object is in a hierarchical system, specify the monitored dimension in hierarchical form when you use an API to query the metrics of this object.

For example, if you want to query the CPU usage (cassandra001_cpu_usage) and the dimension of the metric is cassandra_cluster_id,cassandra_node_id, cassandra_cluster_id indicates level 0 and cassandra_node_id indicates level 1.

  • To query a single metric by calling an API, the cassandra_node_id dimension is used as follows:

    dim.0=cassandra_cluster_id,4dd5708e1730498e92d314fc7eb2117ein12&dim.1=cassandra_node_id,0c45432dccee461994bcee6a93807943no12

    4dd5708e1730498e92d314fc7eb2117ein12 and 0c45432dccee461994bcee6a93807943no12 are the dimension values of cassandra_cluster_id and cassandra_node_id, respectively. For details about how to obtain the values, see Dimensions.

  • To batch query metrics by calling the API, the cassandra_node_id dimension is used as follows: 
    "dimensions": [
    {
        "name": "cassandra_cluster_id",
        "value": "4dd5708e1730498e92d314fc7eb2117ein12"
    },
    {
        "name": "cassandra_node_id",
        "value": "0c45432dccee461994bcee6a93807943no12"
    }
]

    4dd5708e1730498e92d314fc7eb2117ein12 and 0c45432dccee461994bcee6a93807943no12 are the dimension values of cassandra_cluster_id and cassandra_node_id, respectively. For details about how to obtain the values, see Dimensions.

Dimensions

Key

Value

cassandra_cluster_id

Cluster ID of the GeminiDB Cassandra instance

You can obtain the value by following Querying Host Metrics from Different Dimensions.

cassandra_node_id

Node ID of the GeminiDB Cassandra instance

You can obtain the value by following Querying Host Metrics from Different Dimensions.
Parent Topic: Viewing Metrics and Configuring Alarms