AxonOps All Dashboards Metrics Reference

This document provides a comprehensive reference of all metrics used across AxonOps dashboards, organized by metric prefix and category.

Table of Contents

1. System Metrics (host_)
2. JVM Metrics (jvm_)
3. Cassandra Metrics (cas_)
4. Client Metrics (client_)
5. Authentication Metrics
6. Event-Based Monitoring
7. Special Functions and Attributes

System Metrics (host_)

System-level metrics collected from the operating system.

CPU Metrics

Metric	Description	Common Attributes	Used In
host_CPU_Percent_Merge	Merged CPU usage percentage	time (real/user/sys), dc, rack, host_id	System, Overview, Reporting

Memory Metrics

Metric	Description	Common Attributes	Used In
host_Memory_Used	Used memory in bytes	dc, rack, host_id	System, Overview
host_Memory_Free	Free memory in bytes	dc, rack, host_id	System
host_Memory_Total	Total memory in bytes	dc, rack, host_id	System
host_Memory_Buffers	Buffer memory	dc, rack, host_id	System
host_Memory_Cached	Cached memory	dc, rack, host_id	System

Disk Metrics

Metric	Description	Common Attributes	Used In
host_Disk_UsedPercent	Disk usage percentage	mountpoint, dc, rack, host_id	System, Overview, Reporting
host_Disk_Used	Used disk space in bytes	mountpoint, dc, rack, host_id	System, Reporting
host_Disk_SectorsRead	Disk sectors read	partition, axonfunction (rate), dc, rack, host_id	System, Reporting
host_Disk_SectorsWrite	Disk sectors written	partition, axonfunction (rate), dc, rack, host_id	System, Reporting

Network Metrics

Metric	Description	Common Attributes	Used In
host_Network_ReceiveBytes	Network bytes received	interface, axonfunction (rate), dc, rack, host_id	System
host_Network_TransmitBytes	Network bytes transmitted	interface, axonfunction (rate), dc, rack, host_id	System

JVM Metrics (jvm_)

Java Virtual Machine metrics for monitoring Cassandra’s JVM.

Memory Pool Metrics

Metric	Description	Common Attributes	Used In
jvm_Memory_Heap	Heap memory usage	type (usage/init/committed/max), dc, rack, host_id	System, Overview
jvm_MemoryPool_*	Specific memory pool metrics	pool_name, type, dc, rack, host_id	System

Garbage Collection Metrics

Metric	Description	Common Attributes	Used In
jvm_GarbageCollector_*	GC metrics by collector	collector_name, function (CollectionTime/CollectionCount), axonfunction (rate), dc, rack, host_id	System, Table
jvm_GarbageCollector_G1_Young_Generation	G1 young gen GC	See above	System, Table
jvm_GarbageCollector_Shenandoah_Cycles	Shenandoah GC cycles	See above	Table
jvm_GarbageCollector_Shenandoah_Pauses	Shenandoah GC pauses	See above	Table
jvm_GarbageCollector_ZGC	ZGC metrics	See above	Table

Cassandra Metrics (cas_)

Cassandra-specific metrics.

Client Connection Metrics

Metric	Description	Common Attributes	Used In
cas_Client_connectedNativeClients	Connected native protocol clients	dc, rack, host_id	Application, Coordinator

Client Request Metrics

Metric	Description	Common Attributes	Used In
cas_ClientRequest_Latency	Request latency at coordinator	scope (Read*/Write*/RangeSlice), function (percentiles/Count), axonfunction (rate), dc, rack, host_id	Overview, Coordinator, Reporting
cas_ClientRequest_Timeouts	Request timeouts	scope (Read/Write), function (Count), axonfunction (rate), dc, rack, host_id	Overview, Entropy
cas_ClientRequest_Unavailables	Unavailable exceptions	scope (Read/Write), function (Count), axonfunction (rate), dc, rack, host_id	Overview, Entropy

Cache Metrics

Metric	Description	Common Attributes	Used In
cas_Cache_*	Cache statistics	scope (KeyCache/RowCache/CounterCache), metric (Capacity/Size/Hits/Requests), dc, rack, host_id	Cache

Compaction Metrics

Metric	Description	Common Attributes	Used In
cas_Compaction_TotalCompactionsCompleted	Completed compactions	axonfunction (rate), dc, rack, host_id	Compactions
cas_Compaction_BytesCompacted	Bytes compacted	axonfunction (rate), dc, rack, host_id	Compactions
cas_CompactionManager_*	Compaction manager metrics	metric (PendingTasks/CompletedTasks), dc, rack, host_id	Compactions

Table Metrics

Metric	Description	Common Attributes	Used In
cas_Table_ReadLatency	Local read latency	keyspace, scope (table), function (percentiles/Count), axonfunction (rate), dc, rack, host_id	Table
cas_Table_WriteLatency	Local write latency	See above	Table
cas_Table_RangeLatency	Local range query latency	See above	Table
cas_Table_CoordinatorReadLatency	Coordinator read latency	See above	Table
cas_Table_CoordinatorWriteLatency	Coordinator write latency	See above	Table
cas_Table_CoordinatorScanLatency	Coordinator range scan latency	See above	Table
cas_Table_LiveDiskSpaceUsed	Live data disk space	keyspace, scope (table), function (Count), dc, rack, host_id	Data, Table, Keyspace
cas_Table_TotalDiskSpaceUsed	Total disk space	See above	Data
cas_Table_CompressionRatio	Compression effectiveness	keyspace, scope (table), dc, rack, host_id	Data
cas_Table_LiveSSTableCount	Number of SSTables	See above	Data, Table
cas_Table_MinPartitionSize	Minimum partition size	See above	Data
cas_Table_MeanPartitionSize	Average partition size	See above	Data, Table
cas_Table_MaxPartitionSize	Maximum partition size	See above	Data, Table
cas_Table_EstimatedPartitionCount	Estimated partitions	See above	Table
cas_Table_SSTablesPerReadHistogram	SSTables per read	function (percentiles), See above	Table
cas_Table_TombstoneScannedHistogram	Tombstones scanned	See above	Table
cas_Table_SpeculativeRetries	Speculative retry attempts	function (Count), axonfunction (rate), See above	Table
cas_Table_BloomFilterFalseRatio	Bloom filter false positive ratio	See above	Table
cas_Table_BloomFilterDiskSpaceUsed	Bloom filter disk usage	See above	Table
cas_Table_AllMemtablesHeapSize	Memtable heap memory	See above	Table
cas_Table_AllMemtablesOffHeapSize	Memtable off-heap memory	See above	Table

Keyspace Metrics

Metric	Description	Common Attributes	Used In
cas_Keyspace_ReadLatency	Keyspace read latency	keyspace, function (percentiles/Count), axonfunction (rate), dc, rack, host_id	Keyspace
cas_Keyspace_WriteLatency	Keyspace write latency	See above	Keyspace
cas_Keyspace_RangeLatency	Keyspace range latency	See above	Keyspace
cas_Keyspace_MemtableOnHeapDataSize	Keyspace memtable heap size	keyspace, function (Value), dc, rack, host_id	Keyspace
cas_Keyspace_SSTablesPerReadHistogram	SSTables per read by keyspace	keyspace, function (Count), axonfunction (rate), dc, rack, host_id	Keyspace

Thread Pool Metrics

Metric	Description	Common Attributes	Used In
cas_ThreadPools_request	Request thread pools	scope (pool name), key (ActiveTasks/PendingTasks/CompletedTasks), axonfunction (rate), dc, rack, host_id	Thread Pools, Entropy
cas_ThreadPools_internal	Internal thread pools	See above	Thread Pools, Entropy
cas_ThreadPools_transport	Transport thread pools	See above	Thread Pools

Storage Metrics

Metric	Description	Common Attributes	Used In
cas_Storage_TotalHints	Total hints created	axonfunction (rate), dc, rack, host_id	Entropy
cas_Storage_TotalHintsInProgress	Active hints being delivered	dc, rack, host_id	Entropy

Read Repair Metrics

Metric	Description	Common Attributes	Used In
cas_ReadRepair_Attempted	Read repair attempts	function (Count), axonfunction (rate), dc, rack, host_id	Entropy
cas_ReadRepair_RepairedBackground	Background repairs completed	See above	Entropy
cas_ReadRepair_RepairedBlocking	Blocking repairs completed	See above	Entropy

CQL Metrics

Metric	Description	Common Attributes	Used In
cas_CQL_PreparedStatementsExecuted	Prepared statements executed	function (Count), axonfunction (rate), dc, rack, host_id	CQL
cas_CQL_RegularStatementsExecuted	Regular statements executed	See above	CQL
cas_CQL_PreparedStatementsCount	Cached prepared statements	function (Value), axonfunction (rate), dc, rack, host_id	CQL
cas_CQL_PreparedStatementsRatio	Prepared statement ratio	function (Value), dc, rack, host_id	CQL

Dropped Message Metrics

Metric	Description	Common Attributes	Used In
cas_DroppedMessage_Dropped	Dropped messages by type	scope (MUTATION/READ/HINT/etc), function (Count), axonfunction (rate), dc, rack, host_id	Dropped Messages

CommitLog Metrics

Metric	Description	Common Attributes	Used In
cas_CommitLog_WaitingOnSegmentAllocation	Time waiting for segment allocation	function (percentile), dc, rack, host_id	Coordinator

Client Metrics (client_)

Application-level client interaction metrics.

Metric	Description	Common Attributes	Used In
client_throughput_read	Client read throughput	dc, rack, host_id	Application, Overview
client_throughput_write	Client write throughput	dc, rack, host_id	Application, Overview
client_latency_read	Client read latency	function (percentile), dc, rack, host_id	Application, Overview
client_latency_write	Client write latency	function (percentile), dc, rack, host_id	Application, Overview

Authentication Metrics

Metric	Description	Common Attributes	Used In
cas_authentication_success	Successful authentications	username, axonfunction (rate), dc, rack, host_id	Security

Event-Based Monitoring

The Security dashboard primarily uses event filtering rather than metrics.

Event Types

Event Type	Source	Description	Used In
authentication	Cassandra	Authentication attempts	Security
authorization	Cassandra	Authorization attempts	Security
DDL_query	Cassandra	Data Definition Language queries	Security
DCL_query	Cassandra	Data Control Language queries	Security
DML_query	Cassandra	Data Manipulation Language queries	Security
jmx	System	JMX access events	Security

Special Functions and Attributes

Common Function Values

• Percentiles: 50thPercentile, 75thPercentile, 95thPercentile, 98thPercentile, 99thPercentile, 999thPercentile

• Aggregations: Count, Min, Max, Mean, Value

• Special: axonfunction='rate' - Converts counter to rate

Common Attributes

• Location: dc (datacenter), rack, host_id (node)

• Scope: Varies by metric type (table name, cache name, thread pool name, etc.)

• Filtering: groupBy - Dynamic aggregation dimension

Scope Patterns for ClientRequest Metrics

• Read Operations: Read, Read-ALL, Read-ONE, Read-QUORUM, etc.

• Write Operations: Write, Write-ALL, Write-ANY, Write-QUORUM, etc.

• Range Operations: RangeSlice

Dropped Message Scopes

• MUTATION, COUNTER_MUTATION, HINT, READ, RANGE_SLICE, PAGED_RANGE
• READ_REPAIR, BATCH_STORE, BATCH_REMOVE, REQUEST_RESPONSE, _TRACE

Metric Naming Conventions

Prefix indicates source:

• host_ - System metrics
• jvm_ - JVM metrics
• cas_ - Cassandra metrics
• client_ - Client application metrics

Middle part indicates component:

• Examples: CPU, Memory, Disk, Table, Keyspace, Cache

Suffix indicates measurement:

• Examples: Latency, Count, Size, Ratio, Used

Notes

• Some metrics use axonfunction='rate' to calculate per-second rates from counters
• The function attribute typically indicates the aggregation or percentile
• Many queries filter out Min and Max values using function!='Min|Max'
• Event-based panels (mainly in Security dashboard) don’t use metrics queries
• Some metrics have special scope filters like scope!='' to exclude empty values