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README.md

MySQL Input plugin

This plugin gathers the statistic data from MySQL server

  • Global statuses
  • Global variables
  • Slave statuses
  • Binlog size
  • Process list
  • User Statistics
  • Info schema auto increment columns
  • InnoDB metrics
  • Table I/O waits
  • Index I/O waits
  • Perf Schema table lock waits
  • Perf Schema event waits
  • Perf Schema events statements
  • File events statistics
  • Table schema statistics

Configuration

# Read metrics from one or many mysql servers
[[inputs.mysql]]
  ## specify servers via a url matching:
  ##  [username[:password]@][protocol[(address)]]/[?tls=[true|false|skip-verify]]
  ##  see https://github.com/go-sql-driver/mysql#dsn-data-source-name
  ##  e.g.
  ##    servers = ["user:passwd@tcp(127.0.0.1:3306)/?tls=false"]
  ##    servers = ["user@tcp(127.0.0.1:3306)/?tls=false"]
  #
  ## If no servers are specified, then localhost is used as the host.
  servers = ["tcp(127.0.0.1:3306)/"]
  ## the limits for metrics form perf_events_statements
  perf_events_statements_digest_text_limit  = 120
  perf_events_statements_limit              = 250
  perf_events_statements_time_limit         = 86400
  #
  ## if the list is empty, then metrics are gathered from all database tables
  table_schema_databases                    = []
  #
  ## gather metrics from INFORMATION_SCHEMA.TABLES for databases provided above list
  gather_table_schema                       = false
  #
  ## gather thread state counts from INFORMATION_SCHEMA.PROCESSLIST
  gather_process_list                       = true
  #
  ## gather thread state counts from INFORMATION_SCHEMA.USER_STATISTICS
  gather_user_statistics                    = true
  #
  ## gather auto_increment columns and max values from information schema
  gather_info_schema_auto_inc               = true
  #
  ## gather metrics from INFORMATION_SCHEMA.INNODB_METRICS
  gather_innodb_metrics                     = true
  #
  ## gather metrics from SHOW SLAVE STATUS command output
  gather_slave_status                       = true
  #
  ## gather metrics from SHOW BINARY LOGS command output
  gather_binary_logs                        = false
  #
  ## gather metrics from PERFORMANCE_SCHEMA.TABLE_IO_WAITS_SUMMARY_BY_TABLE
  gather_table_io_waits                     = false
  #
  ## gather metrics from PERFORMANCE_SCHEMA.TABLE_LOCK_WAITS
  gather_table_lock_waits                   = false
  #
  ## gather metrics from PERFORMANCE_SCHEMA.TABLE_IO_WAITS_SUMMARY_BY_INDEX_USAGE
  gather_index_io_waits                     = false
  #
  ## gather metrics from PERFORMANCE_SCHEMA.EVENT_WAITS
  gather_event_waits                        = false
  #
  ## gather metrics from PERFORMANCE_SCHEMA.FILE_SUMMARY_BY_EVENT_NAME
  gather_file_events_stats                  = false
  #
  ## gather metrics from PERFORMANCE_SCHEMA.EVENTS_STATEMENTS_SUMMARY_BY_DIGEST
  gather_perf_events_statements             = false
  #
  ## Some queries we may want to run less often (such as SHOW GLOBAL VARIABLES)
  interval_slow                             = "30m"
  
  ## Optional SSL Config (will be used if tls=custom parameter specified in server uri)
  ssl_ca = "/etc/telegraf/ca.pem"
  ssl_cert = "/etc/telegraf/cert.pem"
  ssl_key = "/etc/telegraf/key.pem"

Measurements & Fields

  • Global statuses - all numeric and boolean values of SHOW GLOBAL STATUSES
  • Global variables - all numeric and boolean values of SHOW GLOBAL VARIABLES
  • Slave status - metrics from SHOW SLAVE STATUS the metrics are gathered when the single-source replication is on. If the multi-source replication is set, then everything works differently, this metric does not work with multi-source replication.
  • Binary logs - all metrics including size and count of all binary files. Requires to be turned on in configuration.
    • binary_size_bytes(int, number)
    • binary_files_count(int, number)
  • Process list - connection metrics from processlist for each user. It has the following tags
    • connections(int, number)
  • User Statistics - connection metrics from user statistics for each user. It has the following fields
    • access_denied
    • binlog_bytes_written
    • busy_time
    • bytes_received
    • bytes_sent
    • commit_transactions
    • concurrent_connections
    • connected_time
    • cpu_time
    • denied_connections
    • empty_queries
    • hostlost_connections
    • other_commands
    • rollback_transactions
    • rows_fetched
    • rows_updated
    • select_commands
    • server
    • table_rows_read
    • total_connections
    • total_ssl_connections
    • update_commands
    • user
  • Perf Table IO waits - total count and time of I/O waits event for each table and process. It has following fields:
    • table_io_waits_total_fetch(float, number)
    • table_io_waits_total_insert(float, number)
    • table_io_waits_total_update(float, number)
    • table_io_waits_total_delete(float, number)
    • table_io_waits_seconds_total_fetch(float, milliseconds)
    • table_io_waits_seconds_total_insert(float, milliseconds)
    • table_io_waits_seconds_total_update(float, milliseconds)
    • table_io_waits_seconds_total_delete(float, milliseconds)
  • Perf index IO waits - total count and time of I/O waits event for each index and process. It has following fields:
    • index_io_waits_total_fetch(float, number)
    • index_io_waits_seconds_total_fetch(float, milliseconds)
    • index_io_waits_total_insert(float, number)
    • index_io_waits_total_update(float, number)
    • index_io_waits_total_delete(float, number)
    • index_io_waits_seconds_total_insert(float, milliseconds)
    • index_io_waits_seconds_total_update(float, milliseconds)
    • index_io_waits_seconds_total_delete(float, milliseconds)
  • Info schema autoincrement statuses - autoincrement fields and max values for them. It has following fields:
    • auto_increment_column(int, number)
    • auto_increment_column_max(int, number)
  • InnoDB metrics - all metrics of information_schema.INNODB_METRICS with a status "enabled"
  • Perf table lock waits - gathers total number and time for SQL and external lock waits events for each table and operation. It has following fields. The unit of fields varies by the tags.
    • read_normal(float, number/milliseconds)
    • read_with_shared_locks(float, number/milliseconds)
    • read_high_priority(float, number/milliseconds)
    • read_no_insert(float, number/milliseconds)
    • write_normal(float, number/milliseconds)
    • write_allow_write(float, number/milliseconds)
    • write_concurrent_insert(float, number/milliseconds)
    • write_low_priority(float, number/milliseconds)
    • read(float, number/milliseconds)
    • write(float, number/milliseconds)
  • Perf events waits - gathers total time and number of event waits
    • events_waits_total(float, number)
    • events_waits_seconds_total(float, milliseconds)
  • Perf file events statuses - gathers file events statuses
    • file_events_total(float,number)
    • file_events_seconds_total(float, milliseconds)
    • file_events_bytes_total(float, bytes)
  • Perf events statements - gathers attributes of each event
    • events_statements_total(float, number)
    • events_statements_seconds_total(float, millieconds)
    • events_statements_errors_total(float, number)
    • events_statements_warnings_total(float, number)
    • events_statements_rows_affected_total(float, number)
    • events_statements_rows_sent_total(float, number)
    • events_statements_rows_examined_total(float, number)
    • events_statements_tmp_tables_total(float, number)
    • events_statements_tmp_disk_tables_total(float, number)
    • events_statements_sort_merge_passes_totales(float, number)
    • events_statements_sort_rows_total(float, number)
    • events_statements_no_index_used_total(float, number)
  • Table schema - gathers statistics of each schema. It has following measurements
    • info_schema_table_rows(float, number)
    • info_schema_table_size_data_length(float, number)
    • info_schema_table_size_index_length(float, number)
    • info_schema_table_size_data_free(float, number)
    • info_schema_table_version(float, number)

Tags

  • All measurements has following tags
    • server (the host name from which the metrics are gathered)
  • Process list measurement has following tags
    • user (username for whom the metrics are gathered)
  • User Statistics measurement has following tags
    • user (username for whom the metrics are gathered)
  • Perf table IO waits measurement has following tags
    • schema
    • name (object name for event or process)
  • Perf index IO waits has following tags
    • schema
    • name
    • index
  • Info schema autoincrement statuses has following tags
    • schema
    • table
    • column
  • Perf table lock waits has following tags
    • schema
    • table
    • sql_lock_waits_total(fields including this tag have numeric unit)
    • external_lock_waits_total(fields including this tag have numeric unit)
    • sql_lock_waits_seconds_total(fields including this tag have millisecond unit)
    • external_lock_waits_seconds_total(fields including this tag have millisecond unit)
  • Perf events statements has following tags
    • event_name
  • Perf file events statuses has following tags
    • event_name
    • mode
  • Perf file events statements has following tags
    • schema
    • digest
    • digest_text
  • Table schema has following tags
    • schema
    • table
    • component
    • type
    • engine
    • row_format
    • create_options