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Exposing system metrics (Enterprise)

In production systems, monitoring of applications is crucial, and that includes databases as well. Memgraph allows tracking information about transactions, query latencies, snapshot recovery latencies, triggers, bolt messages, indexes, streams, and many more using an HTTP server.

Exposing metrics is a Memgraph Enterprise feature and therefore needs a valid Memgraph Enterprise license key. After successfully entering the license key, Memgraph needs to be restarted in order to start the metrics HTTP server.

Configuring the HTTP endpoint

The default address and port for the metrics server is, and can be configured using configuration flags --metrics-address and --metrics-port. If you need help changing the configuration follow the how-to guide.

System metrics

All system metrics measuring different parts of the system can be divided into three different types:

  • Gauge - a single value of some variable in the system (e.g. memory usage)
  • Counter (uint64_t) - a value that can be incremented or decremented (e.g. number of active transactions in the system)
  • Histogram (uint64_t) - distribution of measured values (e.g. certain percentile of query latency on N measured queries)

General metrics

vertex_countGauge (uint64_t)Number of nodes stored in the system.
edge_countGauge (uint64_t)Number of relationships stored in the system.
average_degreeGauge (double)Average number of relationships of a single node.
memory_usageGauge (uint64_t)Amount of RAM used reported by the OS (in bytes).
disk_usageGauge (uint64_t)Amount of disk space used by the data directory (in bytes).

Index metrics

ActiveLabelIndicesCounterNumber of active label indices in the system.
ActiveLabelPropertyIndicesCounterNumber of active label property indices in the system.

Operator metrics

Before a Cypher query is executed, it is converted into an internal form suitable for execution, known as a query plan. A query plan is a tree-like data structure describing a pipeline of operations that will be performed on the database in order to yield the results for a given query. Every node within a plan is known as a logical operator and describes a particular operation.

OnceOperatorCounterNumber of times Once operator was used.
CreateNodeOperatorCounterNumber of times CreateNode operator was used.
CreateExpandOperatorCounterNumber of times CreateExpand operator was used.
ScanAllOperatorCounterNumber of times ScanAll operator was used.
ScanAllByLabelOperatorCounterNumber of times ScanAllByLabel operator was used.
ScanAllByLabelPropertyRangeOperatorCounterNumber of times ScanAllByLabelPropertyRange operator was used.
ScanAllByLabelPropertyValueOperatorCounterNumber of times ScanAllByLabelPropertyValue operator was used.
ScanAllByLabelPropertyOperatorCounterNumber of times ScanAllByLabelProperty operator was used.
ScanAllByLabelIdOperatorCounterNumber of times ScanAllByLabelId operator was used.
ExpandOperatorCounterNumber of times Expand operator was used.
ExpandVariableOperatorCounterNumber of times ExpandVariable operator was used.
ConstructNamedPathOperatorCounterNumber of times ConstructNamedPath operator was used.
FilterOperatorCounterNumber of times Filter operator was used.
ProduceOperatorCounterNumber of times Produce operator was used.
DeleteOperatorCounterNumber of times Delete operator was used.
SetPropertyOperatorCounterNumber of times SetProperty operator was used.
SetPropertiesOperatorCounterNumber of times SetProperties operator was used.
SetLabelsOperatorCounterNumber of times SetLabels operator was used.
RemovePropertyOperatorCounterNumber of times RemoveProperty operator was used.
RemoveLabelsOperatorCounterNumber of times RemoveLabels operator was used.
EdgeUniquenessFilterOperatorCounterNumber of times EdgeUniquenessFilter operator was used.
EmptyResultOperatorCounterNumber of times EmptyResult operator was used.
AccumulateOperatorCounterNumber of times Accumulate operator was used.
AggregateOperatorCounterNumber of times Aggregate operator was used.
SkipOperatorCounterNumber of times Skip operator was used.
LimitOperatorCounterNumber of times Limit operator was used.
OrderByOperatorCounterNumber of times OrderBy operator was used.
MergeOperatorCounterNumber of times Merge operator was used.
OptionalOperatorCounterNumber of times Optional operator was used.
UnwindOperatorCounterNumber of times Unwind operator was used.
DistinctOperatorCounterNumber of times Distinct operator was used.
UnionOperatorCounterNumber of times Union operator was used.
CartesianOperatorCounterNumber of times Cartesian operator was used.
CallProcedureOperatorCounterNumber of times CallProcedureOperator operator was used.
ForeachOperatorCounterNumber of times Foreach operator was used.
EvaluatePatternFilterOperatorCounterNumber of times EvaluatePatternFilter operator was used.
ApplyOperatorCounterNumber of times Apply operator was used.

Query metrics

QueryExecutionLatency_us_50pHistogramQuery execution latency in microseconds (50th percentile).
QueryExecutionLatency_us_90pHistogramQuery execution latency in microseconds (90th percentile).
QueryExecutionLatency_us_99pHistogramQuery execution latency in microseconds (99th percentile).

Query type metrics

ReadQueryCounterNumber of read-only queries executed.
WriteQueryCounterNumber of write-only queries executed.
ReadWriteQueryCounterNumber of read-write queries executed.

Session metrics

ActiveSessionsCounterNumber of active connections.
ActiveBoltSessionsCounterNumber of active Bolt connections.
ActiveTCPSessionsCounterNumber of active TCP connections.
ActiveSSLSessionsCounterNumber of active SSL connections.
ActiveWebSocketSessionsCounterNumber of active websocket connections.
BoltMessagesCounterNumber of Bolt messages sent.

Snapshot metrics

SnapshotCreationLatency_us_50pHistogramSnapshot creation latency in microseconds (50th percentile).
SnapshotCreationLatency_us_90pHistogramSnapshot creation latency in microseconds (90th percentile)-
SnapshotCreationLatency_us_99pHistogramSnapshot creation latency in microseconds (99th percentile).
SnapshotRecoveryLatency_us_50pHistogramSnapshot recovery latency in microseconds (50th percentile).
SnapshotRecoveryLatency_us_90pHistogramSnapshot recovery latency in microseconds (90th percentile).
SnapshotRecoveryLatency_us_99pHistogramSnapshot recovery latency in microseconds (99th percentile).

Stream metrics

StreamsCreatedCounterNumber of streams created.
MessagesConsumedCounterNumber of consumed streamed messages.

Transaction metrics

ActiveTransactionsCounterNumber of active transactions.
CommitedTransactionsCounterNumber of committed transactions.
RollbackedTransactionsCounterNumber of rollbacked transactions.
FailedQueryCounterNumber of times executing a query failed (either during parse time or runtime).

Trigger metrics

TriggersCreatedCounterNumber of Triggers created.
TriggersExecutedCounterNumber of Triggers executed.

Example response

If there aren't any modifying configurations, by sending a GET request to localhost:9091 in the local Memgraph build will result in a response similar to the one below.

"General": {
"average_degree": 0.0,
"disk_usage": 1417846,
"edge_count": 0,
"memory_usage": 36937728,
"vertex_count": 0
"Index": {
"ActiveLabelIndices": 0,
"ActiveLabelPropertyIndices": 0
"Operator": {
"AccumulateOperator": 0,
"AggregateOperator": 0,
"ApplyOperator": 0,
"CallProcedureOperator": 0,
"CartesianOperator": 0,
"ConstructNamedPathOperator": 0,
"CreateExpandOperator": 0,
"CreateNodeOperator": 0,
"DeleteOperator": 0,
"DistinctOperator": 0,
"EdgeUniquenessFilterOperator": 0,
"EmptyResultOperator": 0,
"EvaluatePatternFilterOperator": 0,
"ExpandOperator": 0,
"ExpandVariableOperator": 0,
"FilterOperator": 0,
"ForeachOperator": 0,
"LimitOperator": 0,
"MergeOperator": 0,
"OnceOperator": 0,
"OptionalOperator": 0,
"OrderByOperator": 0,
"ProduceOperator": 0,
"RemoveLabelsOperator": 0,
"RemovePropertyOperator": 0,
"ScanAllByIdOperator": 0,
"ScanAllByLabelOperator": 0,
"ScanAllByLabelPropertyOperator": 0,
"ScanAllByLabelPropertyRangeOperator": 0,
"ScanAllByLabelPropertyValueOperator": 0,
"ScanAllOperator": 0,
"SetLabelsOperator": 0,
"SetPropertiesOperator": 0,
"SetPropertyOperator": 0,
"SkipOperator": 0,
"UnionOperator": 0,
"UnwindOperator": 0
"Query": {
"QueryExecutionLatency_us_50p": 0,
"QueryExecutionLatency_us_90p": 0,
"QueryExecutionLatency_us_99p": 0
"QueryType": {
"ReadQuery": 0,
"ReadWriteQuery": 0,
"WriteQuery": 0
"Session": {
"ActiveBoltSessions": 0,
"ActiveSSLSessions": 0,
"ActiveSessions": 0,
"ActiveTCPSessions": 0,
"ActiveWebSocketSessions": 0,
"BoltMessages": 0
"Snapshot": {
"SnapshotCreationLatency_us_50p": 4860,
"SnapshotCreationLatency_us_90p": 4860,
"SnapshotCreationLatency_us_99p": 4860,
"SnapshotRecoveryLatency_us_50p": 628,
"SnapshotRecoveryLatency_us_90p": 628,
"SnapshotRecoveryLatency_us_99p": 628
"Stream": {
"MessagesConsumed": 0,
"StreamsCreated": 0
"Transaction": {
"ActiveTransactions": 0,
"CommitedTransactions": 0,
"FailedQuery": 0,
"RollbackedTransactions": 0
"Trigger": {
"TriggersCreated": 0,
"TriggersExecuted": 0