Age Metrics

The Hydrolix stack includes Prometheus, an open-source metrics database. While the Stack runs, Hydrolix continuously updates its Prometheus instance with metrics information. You can query, view, and actively monitor this information through the use of a stack's Grafana instance or you can access it via your own monitoring platform.

Using Prometheus directly

Prometheus has its own web-based UI, available by visiting in your web browser.

This view is far more basic than Grafana's, suitable for quickly entering queries and seeing simple, graphed results. Hydrolix does make this feature available immediately, without any additional setup.


query_countCounterDecay/Reaper calls to the Catalog.
query_failureCounterDecay/Reaper failed Catalog calls.
query_latency_summaryCounterLatency in calls to catalog.
query_latency_summary_count/sumCounterLatency in calls to catalog.


The following are suggested metrics to monitor your RabbitMQ service

rabbitmq_queue_messagesCounterSum of ready and unacknowledged messages (queue depth).
rabbitmq_queuesCounterRabbitMQ Queues count.
erlang_vm_statistics_bytes_received_totalCounterThe total number of bytes received through RabbitMQ ports.
erlang_vm_statistics_bytes_output_totalCounterThe total number of bytes output through RabbitMQ ports.

Additional Metrics on can be found on the RabbitMQ Site


Cloud Storage metrics.

net_http_status_code_bucketCounterBatch (inc. Autoingest), Kafka, Kinesis, Stream HTTPHTTP Status Code histogram count from Storage.

Additional Metrics

Additional Metrics are provided for the management and control of different components.

General Metrics.

These metrics track various counters and statistics regarding data ingestion.

process_cpu_seconds_totalCounterTotal user and system CPU time spent in seconds.
process_max_fdsGaugeMaximum number of open file descriptors.
process_open_fdsGaugeNumber of open file descriptors.
process_resident_memory_bytesGaugeResident memory size in bytes.
process_start_time_secondsGaugeStart time of the process since unix epoch in seconds.
process_virtual_memory_bytesGaugeVirtual memory size in bytes.
process_virtual_memory_max_bytesGaugeMaximum amount of virtual memory available in bytes.
promhttp_metric_handler_requests_in_flightGaugeCurrent number of scrapes being served.
promhttp_metric_handler_requests_totalCounterTotal number of scrapes by HTTP status code.

Go environment metrics

These metrics track resources used by Hydrolix's Go environments.

go_gc_duration_secondsSummaryA summary of the pause duration of garbage collection cycles.
go_goroutinesGaugeNumber of goroutines that currently exist.
go_infoGaugeInformation about the Go environment.
go_memstats_alloc_bytesGaugeNumber of bytes allocated and still in use.
go_memstats_alloc_bytes_totalCounterTotal number of bytes allocated, even if freed.
go_memstats_buck_hash_sys_bytesGaugeNumber of bytes used by the profiling bucket hash table.
go_memstats_frees_totalCounterTotal number of frees.
go_memstats_gc_cpu_fractionGaugeThe fraction of this program's available CPU time used by the GC since the program started.
go_memstats_gc_sys_bytesGaugeNumber of bytes used for garbage collection system metadata.
go_memstats_heap_idle_bytesGaugeNumber of heap bytes waiting to be used.
go_memstats_heap_inuse_bytesGaugeNumber of heap bytes that are in use.
go_memstats_heap_objectsGaugeNumber of allocated objects.
go_memstats_heap_released_bytesGaugeNumber of heap bytes released to OS.
go_memstats_heap_sys_bytesGaugeNumber of heap bytes obtained from system.
go_memstats_last_gc_time_secondsGaugeNumber of seconds since 1970 of last garbage collection.
go_memstats_lookups_totalCounterTotal number of pointer lookups.
go_memstats_mallocs_totalCounterTotal number of mallocs.
go_memstats_mcache_inuse_bytesGaugeNumber of bytes in use by mcache structures.
go_memstats_mcache_sys_bytesGaugeNumber of bytes used for mcache structures obtained from system.
go_memstats_mspan_inuse_bytesGaugeNumber of bytes in use by mspan structures.
go_memstats_mspan_sys_bytesGaugeNumber of bytes used for mspan structures obtained from system.
go_memstats_next_gc_bytesGaugeNumber of heap bytes when next garbage collection will take place.
go_memstats_other_sys_bytesGaugeNumber of bytes used for other system allocations.
go_memstats_stack_inuse_bytesGaugeNumber of bytes in use by the stack allocator.
go_memstats_stack_sys_bytesGaugeNumber of bytes obtained from system for stack allocator.
go_memstats_sys_bytesGaugeNumber of bytes obtained from system.
go_threadsGaugeNumber of OS threads created.

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