Metrics - ClickHouse

Metrics are collected for the VeloCloud Clickhouse.

Table 1. Clickhouse Metrics

Component	Metrics
Background	Background | Pool Task
Buffer	Buffers | Allocation (Bytes)
	Buffers | Compressed Read Buffer (Bytes)
	Buffers | Compressed Read Buffer Blocks
	Buffers | IO Allocation (Bytes)
	Buffers | Storage Buffer (Bytes)
	Buffers | Storage Buffer Rows
Events	Events | Context Lock
	Events | Disk Write Elapsed (μs)
	Events | File Open
	Events | Function Execute
	Events | Hard Page Faults
	Events | Lock Readers Wait (μs)
	Events | OS IO wait (ms)
	Events | OS Write (Bytes)
	Events | Query
	Events | Readers Wait (ms)
	Events | Real Time
	Events | Soft Page Faults (μs)
	Events | System Time (μs)
	Events | User Time (μs)
Global Thread	Global | Global Thread
	Global | Global Thread Active
Local Thread	Local | Local Thread
	Local | Local Thread Active
Replicas	Replicas | Max Absolute Delay
	Replicas | Max Insert In Queue
	Replicas | Max Merge In Queue
	Replicas | Max Queue Size
	Replicas | Max Relative Delay
	Replicas | Total Insert In Queue
	Replicas | Total Merge Queues
	Replicas | Total Queue Size
Summary	Summary | Background Pool Task
	Summary | Dict Cache Requests
	Summary | File Open Writes
	Summary | Merge
	Summary | Number of Databases
	Summary | Number of Distributed Send
	Summary | Number of Tables
	Summary | Read
	Summary | Replicated Checks
	Summary | Storage Buffer Rows
	Summary | Uncompressed Cache Cells
	Summary | Uptime
	Summary | Write
	Summary | Zookeeper Session
	Summary | Zookeeper Watch
Write Buffer	Write Buffer | File Descriptor Write
Replicated	Replicated Fetch
Memory	Memory Tracking
Query	Query Thread