MongoDB collector

MongoDB is a source-available cross-platform document-oriented database program.

This module monitors one or more MongoDB instances, depending on your configuration. It collects information and statistics about the server executing the following commands:

• serverStatus
• dbStats
• replSetGetStatus

Prerequisites

Create a read-only user for Netdata in the admin database.

• Authenticate as the admin user:

  use admin
  db.auth("admin", "<MONGODB_ADMIN_PASSWORD>")

• Create a user:

  db.createUser({
    "user":"netdata",
    "pwd": "<UNIQUE_PASSWORD>",
    "roles" : [
      {role: 'read', db: 'admin' },
      {role: 'clusterMonitor', db: 'admin'},
      {role: 'read', db: 'local' }
    ]
  })

Metrics

All metrics have "mongodb." prefix.

• WireTiger metrics are available only if WiredTiger is used as the storage engine.
• Sharding metrics are available on shards only for mongos.

Labels per scope:

• global: no labels.
• lock type: lock_type.
• commit type: commit_type.
• database: database.
• replica set member: repl_set_member.
• shard: shard_id.

Metric	Scope	Dimensions	Units
operations_rate	global	reads, writes, commands	operations/s
operations_latency_time	global	reads, writes, commands	milliseconds
operations_by_type_rate	global	insert, query, update, delete, getmore, command	operations/s
document_operations_rate	global	inserted, deleted, returned, updated	operations/s
scanned_indexes_rate	global	scanned	indexes/s
scanned_documents_rate	global	scanned	documents/s
active_clients_count	global	reads, writes	clients
queued_operations_count	global	reads, writes	operations
lock_acquisitions_rate	lock type	shared, exclusive, intent_shared, intent_exclusive	acquisitions/s
cursors_open_count	global	open	cursors
cursors_open_no_timeout_count	global	open_no_timeout	cursors
cursors_opened_rate	global	opened	cursors/s
cursors_timed_out_rate	global	timed_out	cursors/s
cursors_by_lifespan_count	global	le_1s, 1s_5s, 5s_15s, 15s_30s, 30s_1m, 1m_10m, ge_10m	cursors
transactions_count	global	active, inactive, open, prepared	transactions
transactions_rate	global	started, aborted, committed, prepared	transactions/s
transactions_commits_rate	commit type	success, fail	commits/s
transactions_commits_duration_time	commit type	commits	milliseconds
connections_usage	global	available, used	connections
connections_by_state_count	global	active, threaded, exhaust_is_master, exhaust_hello, awaiting_topology_changes	connections
connections_rate	global	created	connections/s
asserts_rate	global	regular, warning, msg, user, tripwire, rollovers	asserts/s
network_traffic_rate	global	in, out	bytes/s
network_requests_rate	global	requests	requests/s
network_slow_dns_resolutions_rate	global	slow_dns	resolutions/s
network_slow_ssl_handshakes_rate	global	slow_ssl	handshakes/s
memory_resident_size	global	used	bytes
memory_virtual_size	global	used	bytes
memory_page_faults_rate	global	pgfaults	pgfaults/s
memory_tcmalloc_stats	global	allocated, central_cache_freelist, transfer_cache_freelist, thread_cache_freelists, pageheap_freelist, pageheap_unmapped	bytes
wiredtiger_concurrent_read_transactions_usage	global	available, used	transactions
wiredtiger_concurrent_write_transactions_usage	global	available, used	transactions
wiredtiger_cache_usage	global	used	bytes
wiredtiger_cache_dirty_space_size	global	dirty	bytes
wiredtiger_cache_io_rate	global	read, written	pages/s
wiredtiger_cache_evictions_rate	global	unmodified, modified	pages/s
database_collection_count	database	collections	collections
database_indexes_count	database	indexes	indexes
database_views_count	database	views	views
database_documents_count	database	documents	documents
database_data_size	database	data_size	bytes
database_storage_size	database	storage_size	bytes
database_index_size	database	index_size	bytes
repl_set_member_state	replica set member	primary, startup, secondary, recovering, startup2, unknown, arbiter, down, rollback, removed	state
repl_set_member_health_status	replica set member	up, down	status
repl_set_member_replication_lag_time	replica set member	replication_lag	milliseconds
repl_set_member_heartbeat_latency_time	replica set member	heartbeat_latency	milliseconds
repl_set_member_ping_rtt_time	replica set member	ping_rtt	milliseconds
repl_set_member_uptime	replica set member	uptime	seconds
sharding_nodes_count	global	shard_aware, shard_unaware	nodes
sharding_sharded_databases_count	global	partitioned, unpartitioned	databases
sharding_sharded_collections_count	global	partitioned, unpartitioned	collections
sharding_shard_chunks_count	shard	chunks	chunks

Configuration

Edit the go.d/mongodb.conf configuration file using edit-config from the Netdata config directory, which is typically at /etc/netdata.

cd /etc/netdata   # Replace this path with your Netdata config directory, if different
sudo ./edit-config go.d/mongodb.conf

Needs only connection URI. Here is an example for 2 servers:

jobs:
  - name: local
    uri: 'mongodb://user:[email protected]:27017'
    databases:
      include:
        - "* *"

  - name: remote
    dsn: 'mongodb://user:[email protected]:27017'
    databases:
      include:
        - "* *"

If no configuration is given, module will attempt to connect to mongodb daemon on 127.0.0.1:27017 address.

For all available options, see the mongodb collector's configuration file.

Troubleshooting

To troubleshoot issues with the mongodb 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 mongodb