Metrics
Dgraph metrics follow the metric and label conventions for Prometheus.
Disk Metrics
The disk metrics let you track the disk activity of the Dgraph process. Dgraph does not interact directly with the filesystem. Instead it relies on Badger to read from and write to disk.
| Metrics | Description |
|---|---|
badger_v2_disk_reads_total |
Total count of disk reads in Badger. |
badger_v2_disk_writes_total |
Total count of disk writes in Badger. |
badger_v2_gets_total |
Total count of calls to Badger’s get. |
badger_v2_memtable_gets_total |
Total count of memtable accesses to Badger’s get. |
badger_v2_puts_total |
Total count of calls to Badger’s put. |
badger_v2_read_bytes |
Total bytes read from Badger. |
badger_v2_written_bytes |
Total bytes written to Badger. |
Memory Metrics
The memory metrics let you track the memory usage of the Dgraph process. The idle and inuse metrics gives you a better sense of the active memory usage of the Dgraph process. The process memory metric shows the memory usage as measured by the operating system.
By looking at all three metrics you can see how much memory a Dgraph process is holding from the operating system and how much is actively in use.
| Metrics | Description |
|---|---|
dgraph_memory_idle_bytes |
Estimated amount of memory that is being held idle that could be reclaimed by the OS. |
dgraph_memory_inuse_bytes |
Total memory usage in bytes (sum of heap usage and stack usage). |
dgraph_memory_proc_bytes |
Total memory usage in bytes of the Dgraph process. On Linux/macOS, this metric is equivalent to resident set size. On Windows, this metric is equivalent to Go’s runtime.ReadMemStats. |
Activity Metrics
The activity metrics let you track the mutations, queries, and proposals of an Dgraph instance.
| Metrics | Description |
|---|---|
go_goroutines |
Total number of Goroutines currently running in Dgraph. |
dgraph_active_mutations_total |
Total number of mutations currently running. |
dgraph_pending_proposals_total |
Total pending Raft proposals. |
dgraph_pending_queries_total |
Total number of queries in progress. |
dgraph_num_queries_total{method="Server.Mutate"} |
Total number of mutations run in Dgraph. |
dgraph_num_queries_total{method="Server.Query"} |
Total number of queries run in Dgraph. |
Health Metrics
The health metrics let you track to check the availability of an Dgraph Alpha instance.
| Metrics | Description |
|---|---|
dgraph_alpha_health_status |
Only applicable to Dgraph Alpha. Value is 1 when the Alpha is ready to accept requests; otherwise 0. |
Go Metrics
Go’s built-in metrics may also be useful to measure for memory usage and garbage collection time.
| Metrics | Description |
|---|---|
go_memstats_gc_cpu_fraction |
The fraction of this program’s available CPU time used by the GC since the program started. |
go_memstats_heap_idle_bytes |
Number of heap bytes waiting to be used. |
go_memstats_heap_inuse_bytes |
Number of heap bytes that are in use. |