CockroachDB

Plugin: go.d.plugin Module: cockroachdb

Overview

This collector monitors CockroachDB servers.

This collector is supported on all platforms.

This collector supports collecting metrics from multiple instances of this integration, including remote instances.

Default Behavior

Auto-Detection

This integration doesn't support auto-detection.

Limits

The default configuration for this integration does not impose any limits on data collection.

Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

Metrics

Metrics grouped by scope.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.

Per CockroachDB instance

These metrics refer to the entire monitored application.

This scope has no labels.

Metrics:

Metric	Dimensions	Unit
cockroachdb.process_cpu_time_combined_percentage	used	percentage
cockroachdb.process_cpu_time_percentage	user, sys	percentage
cockroachdb.process_cpu_time	user, sys	ms
cockroachdb.process_memory	rss	KiB
cockroachdb.process_file_descriptors	open	fd
cockroachdb.process_uptime	uptime	seconds
cockroachdb.host_disk_bandwidth	read, write	KiB
cockroachdb.host_disk_operations	reads, writes	operations
cockroachdb.host_disk_iops_in_progress	in_progress	iops
cockroachdb.host_network_bandwidth	received, sent	kilobits
cockroachdb.host_network_packets	received, sent	packets
cockroachdb.live_nodes	live_nodes	nodes
cockroachdb.node_liveness_heartbeats	successful, failed	heartbeats
cockroachdb.total_storage_capacity	total	KiB
cockroachdb.storage_capacity_usability	usable, unusable	KiB
cockroachdb.storage_usable_capacity	available, used	KiB
cockroachdb.storage_used_capacity_percentage	total, usable	percentage
cockroachdb.sql_connections	active	connections
cockroachdb.sql_bandwidth	received, sent	KiB
cockroachdb.sql_statements_total	started, executed	statements
cockroachdb.sql_errors	statement, transaction	errors
cockroachdb.sql_started_ddl_statements	ddl	statements
cockroachdb.sql_executed_ddl_statements	ddl	statements
cockroachdb.sql_started_dml_statements	select, update, delete, insert	statements
cockroachdb.sql_executed_dml_statements	select, update, delete, insert	statements
cockroachdb.sql_started_tcl_statements	begin, commit, rollback, savepoint, savepoint_cockroach_restart, release_savepoint_cockroach_restart, rollback_to_savepoint_cockroach_restart	statements
cockroachdb.sql_executed_tcl_statements	begin, commit, rollback, savepoint, savepoint_cockroach_restart, release_savepoint_cockroach_restart, rollback_to_savepoint_cockroach_restart	statements
cockroachdb.sql_active_distributed_queries	active	queries
cockroachdb.sql_distributed_flows	active, queued	flows
cockroachdb.live_bytes	applications, system	KiB
cockroachdb.logical_data	keys, values	KiB
cockroachdb.logical_data_count	keys, values	num
cockroachdb.kv_transactions	committed, fast-path_committed, aborted	transactions
cockroachdb.kv_transaction_restarts	write_too_old, write_too_old_multiple, forwarded_timestamp, possible_reply, async_consensus_failure, read_within_uncertainty_interval, aborted, push_failure, unknown	restarts
cockroachdb.ranges	ranges	ranges
cockroachdb.ranges_replication_problem	unavailable, under_replicated, over_replicated	ranges
cockroachdb.range_events	split, add, remove, merge	events
cockroachdb.range_snapshot_events	generated, applied_raft_initiated, applied_learner, applied_preemptive	events
cockroachdb.rocksdb_read_amplification	reads	reads/query
cockroachdb.rocksdb_table_operations	compactions, flushes	operations
cockroachdb.rocksdb_cache_usage	used	KiB
cockroachdb.rocksdb_cache_operations	hits, misses	operations
cockroachdb.rocksdb_cache_hit_rate	hit_rate	percentage
cockroachdb.rocksdb_sstables	sstables	sstables
cockroachdb.replicas	replicas	replicas
cockroachdb.replicas_quiescence	quiescent, active	replicas
cockroachdb.replicas_leaders	leaders, not_leaseholders	replicas
cockroachdb.replicas_leaseholders	leaseholders	leaseholders
cockroachdb.queue_processing_failures	gc, replica_gc, replication, split, consistency, raft_log, raft_snapshot, time_series_maintenance	failures
cockroachdb.rebalancing_queries	avg	queries/s
cockroachdb.rebalancing_writes	avg	writes/s
cockroachdb.timeseries_samples	written	samples
cockroachdb.timeseries_write_errors	write	errors
cockroachdb.timeseries_write_bytes	written	KiB
cockroachdb.slow_requests	acquiring_latches, acquiring_lease, in_raft	requests
cockroachdb.code_heap_memory_usage	go, cgo	KiB
cockroachdb.goroutines	goroutines	goroutines
cockroachdb.gc_count	gc	invokes
cockroachdb.gc_pause	pause	us
cockroachdb.cgo_calls	cgo	calls

Alerts

The following alerts are available:

Alert name	On metric	Description
cockroachdb_used_storage_capacity	cockroachdb.storage_used_capacity_percentage	storage capacity utilization
cockroachdb_used_usable_storage_capacity	cockroachdb.storage_used_capacity_percentage	storage usable space utilization
cockroachdb_unavailable_ranges	cockroachdb.ranges_replication_problem	number of ranges with fewer live replicas than needed for quorum
cockroachdb_underreplicated_ranges	cockroachdb.ranges_replication_problem	number of ranges with fewer live replicas than the replication target
cockroachdb_open_file_descriptors_limit	cockroachdb.process_file_descriptors	open file descriptors utilization (against softlimit)

Setup

Prerequisites

No action required.

Configuration

File

The configuration file name for this integration is go.d/cockroachdb.conf.

The file format is YAML. Generally, the structure is:

update_every: 1
autodetection_retry: 0
jobs:
  - name: some_name1
  - name: some_name1

You can edit the configuration file using the edit-config script from the Netdata config directory.

cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/cockroachdb.conf

Options

The following options can be defined globally: update_every, autodetection_retry.

Config options

Name	Description	Default	Required
update_every	Data collection frequency.	10	no
autodetection_retry	Recheck interval in seconds. Zero means no recheck will be scheduled.	0	no
url	Server URL.	http://127.0.0.1:8080/_status/vars	yes
timeout	HTTP request timeout.	1	no
username	Username for basic HTTP authentication.		no
password	Password for basic HTTP authentication.		no
proxy_url	Proxy URL.		no
proxy_username	Username for proxy basic HTTP authentication.		no
proxy_password	Password for proxy basic HTTP authentication.		no
method	HTTP request method.	GET	no
body	HTTP request body.		no
headers	HTTP request headers.		no
not_follow_redirects	Redirect handling policy. Controls whether the client follows redirects.	no	no
tls_skip_verify	Server certificate chain and hostname validation policy. Controls whether the client performs this check.	no	no
tls_ca	Certification authority that the client uses when verifying the server's certificates.		no
tls_cert	Client TLS certificate.		no
tls_key	Client TLS key.		no

Examples

Basic

An example configuration.

Config

jobs:
  - name: local
    url: http://127.0.0.1:8080/_status/vars

HTTP authentication

Local server with basic HTTP authentication.

Config

jobs:
  - name: local
    url: http://127.0.0.1:8080/_status/vars
    username: username
    password: password

HTTPS with self-signed certificate

CockroachDB with enabled HTTPS and self-signed certificate.

Config

jobs:
  - name: local
    url: https://127.0.0.1:8080/_status/vars
    tls_skip_verify: yes

Multi-instance

Note: When you define multiple jobs, their names must be unique.

Collecting metrics from local and remote instances.

Config

jobs:
  - name: local
    url: http://127.0.0.1:8080/_status/vars

  - name: remote
    url: http://203.0.113.10:8080/_status/vars

Troubleshooting

Debug Mode

Important: Debug mode is not supported for data collection jobs created via the UI using the Dyncfg feature.

To troubleshoot issues with the cockroachdb collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

• Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

  cd /usr/libexec/netdata/plugins.d/

• Switch to the netdata user.

  sudo -u netdata -s

• Run the go.d.plugin to debug the collector:

  ./go.d.plugin -d -m cockroachdb

Getting Logs

If you're encountering problems with the cockroachdb collector, follow these steps to retrieve logs and identify potential issues:

• Run the command specific to your system (systemd, non-systemd, or Docker container).
• Examine the output for any warnings or error messages that might indicate issues. These messages should provide clues about the root cause of the problem.

System with systemd

Use the following command to view logs generated since the last Netdata service restart:

journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep cockroachdb

System without systemd

Locate the collector log file, typically at /var/log/netdata/collector.log, and use grep to filter for collector's name:

grep cockroachdb /var/log/netdata/collector.log

Note: This method shows logs from all restarts. Focus on the latest entries for troubleshooting current issues.

Docker Container

If your Netdata runs in a Docker container named "netdata" (replace if different), use this command:

docker logs netdata 2>&1 | grep cockroachdb