Prometheus statistics

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kube-controllers can be configured to report a number of metrics through Prometheus. This reporting is enabled by default on port 9094. See the configuration reference for how to change metrics reporting configuration (or disable it completely).

Metric reference

kube-controllers specific

kube-controllers exports a number of Prometheus metrics. The current set is as follows. Since some metrics may be tied to particular implementation choices inside kube-controllers we can’t make any hard guarantees that metrics will persist across releases. However, we aim not to make any spurious changes to existing metrics.

Metric Name Labels Description
ipam_allocations_in_use ippool, node Number of Calico IP allocations currently in use by a workload or interface.
ipam_allocations_borrowed ippool, node Number of Calico IP allocations currently in use where the allocation was borrowed from a block affine to another node.
ipam_allocations_gc_candidates ippool, node Number of Calico IP allocations currently marked by the GC as potential leaks. This metric returns to zero under normal GC operation.
ipam_allocations_gc_reclamations ippool, node Count of Calico IP allocations that have been reclaimed by the GC. Increase of this counter corresponds with a decrease of the candidates gauge under normal operation.
ipam_blocks ippool, node Number of IPAM blocks.
ipam_ippool_size ippool Number of IP addresses in the IP Pool CIDR.
ipam_blocks_per_node node Number of IPAM blocks, indexed by the node to which they have affinity. Prefer ipam_blocks for new integrations.
ipam_allocations_per_node node Number of Calico IP allocations, indexed by node on which the allocation was made. Prefer ipam_allocations_in_use for new integrations.
ipam_allocations_borrowed_per_node node Number of Calico IP allocations borrowed from a non-affine block, indexed by node on which the allocation was made. Prefer ipam_allocations_borrowed for new integrations.

Labels can be interpreted as follows:

Label Name Description
node For allocation metrics, the node on which the allocation was made. For block metrics, the node for which the block has affinity. If the block has no affinity, value will be no_affinity.
ippool The IP Pool that the IPAM block occupies. If there is no IP Pool which matches the block, value will be no_ippool.

Prometheus metrics are self-documenting, with metrics turned on, curl can be used to list the metrics along with their help text and type information.

curl -s http://localhost:9094/metrics | head

CPU / memory metrics

kube-controllers also exports the default set of metrics that Prometheus makes available. Currently, those include:

Name Description
go_gc_duration_seconds A summary of the GC invocation durations.
go_goroutines Number of goroutines that currently exist.
go_memstats_alloc_bytes Number of bytes allocated and still in use.
go_memstats_alloc_bytes_total Total number of bytes allocated, even if freed.
go_memstats_buck_hash_sys_bytes Number of bytes used by the profiling bucket hash table.
go_memstats_frees_total Total number of frees.
go_memstats_gc_sys_bytes Number of bytes used for garbage collection system metadata.
go_memstats_heap_alloc_bytes Number of heap bytes allocated and still in use.
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.
go_memstats_heap_objects Number of allocated objects.
go_memstats_heap_released_bytes_total Total number of heap bytes released to OS.
go_memstats_heap_sys_bytes Number of heap bytes obtained from system.
go_memstats_last_gc_time_seconds Number of seconds since 1970 of last garbage collection.
go_memstats_lookups_total Total number of pointer lookups.
go_memstats_mallocs_total Total number of mallocs.
go_memstats_mcache_inuse_bytes Number of bytes in use by mcache structures.
go_memstats_mcache_sys_bytes Number of bytes used for mcache structures obtained from system.
go_memstats_mspan_inuse_bytes Number of bytes in use by mspan structures.
go_memstats_mspan_sys_bytes Number of bytes used for mspan structures obtained from system.
go_memstats_next_gc_bytes Number of heap bytes when next garbage collection will take place.
go_memstats_other_sys_bytes Number of bytes used for other system allocations.
go_memstats_stack_inuse_bytes Number of bytes in use by the stack allocator.
go_memstats_stack_sys_bytes Number of bytes obtained from system for stack allocator.
go_memstats_sys_bytes Number of bytes obtained by system. Sum of all system allocations.
process_cpu_seconds_total Total user and system CPU time spent in seconds.
process_max_fds Maximum number of open file descriptors.
process_open_fds Number of open file descriptors.
process_resident_memory_bytes Resident memory size in bytes.
process_start_time_seconds Start time of the process since unix epoch in seconds.
process_virtual_memory_bytes Virtual memory size in bytes.
promhttp_metric_handler_requests_in_flight Current number of scrapes being served.
promhttp_metric_handler_requests_total Total number of scrapes by HTTP status code.