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Knative Serving metrics

Administrators can monitor Serving control plane based on the metrics exposed by each Serving component. Metrics are listed next.

Activator

The following metrics can help you to understand how an application responds when traffic passes through the activator. For example, when scaling from zero, high request latency might mean that requests are taking too much time to be fulfilled.

Metric Name Description Type Tags Unit Status
request_concurrency Concurrent requests that are routed to Activator
These are requests reported by the concurrency reporter which may not be done yet.
This is the average concurrency over a reporting period
Gauge configuration_name
container_name
namespace_name
pod_name
revision_name
service_name
Dimensionless Stable
request_count The number of requests that are routed to Activator.
These are requests that have been fulfilled from the activator handler.
Counter configuration_name
container_name
namespace_name
pod_name
response_code
response_code_class
revision_name
service_name
Dimensionless Stable
request_latencies The response time in millisecond for the fulfilled routed requests Histogram configuration_name
container_name
namespace_name
pod_name
response_code
response_code_class
revision_name
service_name
Milliseconds Stable

Autoscaler

Autoscaler component exposes a number of metrics related to its decisions per revision. For example, at any given time, you can monitor the desired pods the Autoscaler wants to allocate for a Service, the average number of requests per second during the stable window, or whether autoscaler is in panic mode (KPA).

Metric Name Description Type Tags Unit Status
desired_pods Number of pods autoscaler wants to allocate Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
excess_burst_capacity Excess burst capacity overserved over the stable window Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
stable_request_concurrency Average of requests count per observed pod over the stable window Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
panic_request_concurrency Average of requests count per observed pod over the panic window Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
target_concurrency_per_pod The desired number of concurrent requests for each pod Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
stable_requests_per_second Average requests-per-second per observed pod over the stable window Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
panic_requests_per_second Average requests-per-second per observed pod over the panic window Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
target_requests_per_second The desired requests-per-second for each pod Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
panic_mode 1 if autoscaler is in panic mode, 0 otherwise Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
requested_pods Number of pods autoscaler requested from Kubernetes Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
actual_pods Number of pods that are allocated currently in ready state Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
not_ready_pods Number of pods that are not ready currently Gauge configuration_name=
namespace_name=
revision_name
service_name
Dimensionless Stable
pending_pods Number of pods that are pending currently Gauge configuration_name
namespace_name
revision_name
service_name
Dimensionless Stable
terminating_pods Number of pods that are terminating currently Gauge configuration_name
namespace_name
revision_name
service_name<br>
Dimensionless Stable
scrape_time Time autoscaler takes to scrape metrics from the service pods in milliseconds Histogram configuration_name
namespace_name
revision_name
service_name
Milliseconds Stable

Controller

The following metrics are emitted by any component that implements a controller logic. The metrics show details about the reconciliation operations and the workqueue behavior on which reconciliation requests are enqueued.

Metric Name Description Type Tags Unit Status
work_queue_depth Depth of the work queue Gauge reconciler Dimensionless Stable
reconcile_count Number of reconcile operations Counter reconciler
success
Dimensionless Stable
reconcile_latency Latency of reconcile operations Histogram reconciler
success
Milliseconds Stable
workqueue_adds_total Total number of adds handled by workqueue Counter name Dimensionless Stable
workqueue_depth Current depth of workqueue Gauge reconciler Dimensionless Stable
workqueue_queue_latency_seconds How long in seconds an item stays in workqueue before being requested Histogram name Seconds Stable
workqueue_retries_total Total number of retries handled by workqueue Counter name Dimensionless Stable
workqueue_work_duration_seconds How long in seconds processing an item from a workqueue takes. Histogram name Seconds Stable
workqueue_unfinished_work_seconds How long in seconds the outstanding workqueue items have been in flight (total). Histogram name Seconds Stable
workqueue_longest_running_processor_seconds How long in seconds the longest outstanding workqueue item has been in flight Histogram name Seconds Stable

Webhook

Webhook metrics report useful info about operations. For example, if a large number of operations fail, this could indicate an issue with a user-created resource.

Metric Name Description Type Tags Unit Status
request_count The number of requests that are routed to webhook Counter admission_allowed
kind_group
kind_kind
kind_version
request_operation
resource_group
resource_namespace
resource_resource
resource_version
Dimensionless Stable
request_latencies The response time in milliseconds Histogram admission_allowed
kind_group
kind_kind
kind_version
request_operation
resource_group
resource_namespace
resource_resource
resource_version
Milliseconds Stable

Go Runtime - memstats

Each Knative Serving control plane process emits a number of Go runtime memory statistics (shown next). As a baseline for monitoring purposes, user could start with a subset of the metrics: current allocations (go_alloc), total allocations (go_total_alloc), system memory (go_sys), mallocs (go_mallocs), frees (go_frees) and garbage collection total pause time (total_gc_pause_ns), next gc target heap size (go_next_gc) and number of garbage collection cycles (num_gc).

Metric Name Description Type Tags Unit Status
go_alloc The number of bytes of allocated heap objects (same as heap_alloc) Gauge name Dimensionless Stable
go_total_alloc The cumulative bytes allocated for heap objects Gauge name Dimensionless Stable
go_sys The total bytes of memory obtained from the OS Gauge name Dimensionless Stable
go_lookups The number of pointer lookups performed by the runtime Gauge name Dimensionless Stable
go_mallocs The cumulative count of heap objects allocated Gauge name Dimensionless Stable
go_frees The cumulative count of heap objects freed Gauge name Dimensionless Stable
go_heap_alloc The number of bytes of allocated heap objects Gauge name Dimensionless Stable
go_heap_sys The number of bytes of heap memory obtained from the OS Gauge name Dimensionless Stable
go_heap_idle The number of bytes in idle (unused) spans Gauge name Dimensionless Stable
go_heap_in_use The number of bytes in in-use spans Gauge name Dimensionless Stable
go_heap_released The number of bytes of physical memory returned to the OS Gauge name Dimensionless Stable
go_heap_objects The number of allocated heap objects Gauge name Dimensionless Stable
go_stack_in_use The number of bytes in stack spans Gauge name Dimensionless Stable
go_stack_sys The number of bytes of stack memory obtained from the OS Gauge name Dimensionless Stable
go_mspan_in_use The number of bytes of allocated mspan structures Gauge name Dimensionless Stable
go_mspan_sys The number of bytes of memory obtained from the OS for mspan structures Gauge name Dimensionless Stable
go_mcache_in_use The number of bytes of allocated mcache structures Gauge name Dimensionless Stable
go_mcache_sys The number of bytes of memory obtained from the OS for mcache structures Gauge name Dimensionless Stable
go_bucket_hash_sys The number of bytes of memory in profiling bucket hash tables. Gauge name Dimensionless Stable
go_gc_sys The number of bytes of memory in garbage collection metadata Gauge name Dimensionless Stable
go_other_sys The number of bytes of memory in miscellaneous off-heap runtime allocations Gauge name Dimensionless Stable
go_next_gc The target heap size of the next GC cycle Gauge name Dimensionless Stable
go_last_gc The time the last garbage collection finished, as nanoseconds since 1970 (the UNIX epoch) Gauge name Nanoseconds Stable
go_total_gc_pause_ns The cumulative nanoseconds in GC stop-the-world pauses since the program started Gauge name Nanoseconds Stable
go_num_gc The number of completed GC cycles. Gauge name Dimensionless Stable
go_num_forced_gc The number of GC cycles that were forced by the application calling the GC function. Gauge name Dimensionless Stable
go_gc_cpu_fraction The fraction of this program's available CPU time used by the GC since the program started Gauge name Dimensionless Stable

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