Canary NG

Measure latency with various handlers and expose Prometheus histograms to measure Service Level Objectives (SLO).

Installation

TLS

openssl req -x509 -newkey ec -pkeyopt ec_paramgen_curve:secp384r1 -days 3650 -nodes -keyout docker/tls/db.key -out docker/tls/db.crt

Configuration

Global

• listen_addr (string): host address to listen for the HTTP service
• route (string): name of the HTTP route to expose metrics
• jobs (list): see Jobs below
• job_label_name (string): name of the Prometheus label registering the job name
• buckets ([]float64): list of thresholds in seconds to define Prometheus buckets
• duration_metric (string): name of the metric registering the duration histogram
• failures_metric (string): name of the metric registering the failures counter
• jobs_metric (string): name of the metric registering the job execution counter
• queries_metric (string): name of the metric registering the queries counter
• query_labels:
  • name (string): name of the label registering the query name
  • connect_value (string): name of the connect query
  • read_value (string): name of the read query
  • write_value (string): name of the write query
  • disconnect_value (string): name of the disconnect query
• log_level (string): level of logging (debug, info, warn (default), error)
• log_format (string): format of log messages (text (default), json)

Jobs

• name (string): name of the job
• type (string): name of the driver to use to perform queries (clickhouse, mongodb, mysql, postgresql, valkey)
• query_type (string): type of queries to measure (read, write, read_write)
• hosts_discovery: see "Host discovery" section
• timeout (int): number of second(s) before returning an error
• interval (int): number of second(s) to wait before next execution
• job_per_host (bool): create a job for each discovered host
• prefix_name_with_host (bool): add host to the job name (when using host discovery for example)
• name_separator (string): character to use to separate host and job name (used when prefix_name_with_host is enabled)
• cache_hostnames (bool): resolve hostnames at startup to exclude DNS resolution time from measurements (ignored for mongodb+srv scheme, disabled by default)

Drivers

ClickHouse

• dsn (string): connection string (ex: clickhouse://***:***@127.0.0.1:9440/canary_clickhouse?secure=true&skip_verify=true)
• hosts ([]string): list of hosts
• username (string): user name used for authentication
• password (string): password used for authentication
• secure (bool): use TLS for the connection
• skip_verify (bool): skip verification of the TLS certificate
• database (string): name of the database
• table (string): name of the table
• create (bool): create table if it doesn't exist (used by read queries)

MongoDB

• dsn (string): connection string (ex: mongodb://127.0.0.1:27017/canary_mongodb?tls=true&tlsInsecure=true)
• scheme (string): scheme for the connection (mongodb, mongodb+srv)
• hosts ([]string): list of hosts
• username (string): user name used for authentication
• password (string): password used for authentication
• tls (bool): use TLS for the connection
• tls_insecure (bool): skip verification of the TLS certificate
• database (string): name of the database
• collection (string): name of collection
• create (bool): create collection if it doesn't exist (used by read queries)

MySQL

• dsn (string): connection string (ex: ***:***@tcp(127.0.0.1:3306)/canary_mysql?tls=skip-verify)
• host (string): host address
• username (string): user name used for authentication
• password (string): password used for authentication
• port (int): connect to this port
• tls_config (string): use TLS for the connection (false, true, skip-verify, preferred)
• allow_native_passwords (bool): allow to connect using the mysql_native_password authentication plugin
• database (string): name of the database
• table (string): name of the table
• create (bool): create table if it doesn't exist (used by read queries)

PostgreSQL

• dsn (string): connection string (ex: postgres://***:***@127.0.0.1:5432/canary_postgresql?sslmode=require)
• hosts ([]string): list of hosts
• port (int): connect to this port
• username (string): user name used for authentication
• password (string): password used for authentication
• sslmode (string): use TLS for the connection (see available modes)
• database (string): name of the database
• table (string): name of the table
• create (bool): create table if it doesn't exist (used by read queries)

Valkey

• dsn (ex: rediss://127.0.0.1:6380/0)
• hosts ([]string): list of hosts
• port (int): connect to this port. If not defined, use ports from the hosts list or 6379.
• master_set (string): enable Sentinel mode and connect to this master set name
• username (string): user name used for authentication
• password (string): password used for authentication
• tls (bool): use TLS for the connection
• skip_verify (bool): skip verification of the TLS certificate
• database (int): database number
• key (string): name of the key
• create (bool): write to key if it doesn't exist (used by read queries)

Host discovery

Canary NG is able to discover a list of hosts instead of defining host or hosts in each job configuration.

Example:

jobs:
  host_discovery:
    type: consul
    token: ***
    node_meta:
      dbms_type: postgresql
    return_meta: vip

Consul

• addresses ([]string): list of Consul servers addresses
• scheme (string): URI scheme of Consul servers (http, https)
• skip_verify (bool): skip verification of the TLS certificate
• datacenter (string): name of the Consul datacenter
• token (string): token used for authentication
• node_meta (map[string][string]): return list of nodes matching these node meta
• return_meta (string): instead of returning the node IP address (by default), return the value of the node meta available on the node
• return_metas ([]string): same as return_meta but with multiple values (return_meta is ignored if return_metas is configured)