SDK metrics

SDK metrics

The information on this page is relevant to Temporal SDKsWhat is a Temporal SDK?

A Temporal SDK is a language-specific library that offers APIs to construct and use a Temporal Client to communicate with a Temporal Cluster, develop Workflow Definitions, and develop Worker Programs.

Learn more.

See Cloud metrics for metrics emitted by Temporal CloudWhat is Temporal Cloud?

Temporal Cloud is a managed, hosted Temporal environment that provides a platform for Temporal Applications.

Learn more.

See Cluster metrics for metrics emitted by the OSS ClusterWhat is a Temporal Cluster?

A Temporal Cluster is the Temporal Server paired with persistence.

Learn more.

The Temporal SDKs emit a set of metrics from Temporal Client usage and Worker Processes.

• How to get started emitting metrics from your SDKHow to emit metrics
  
  Each Temporal SDK is capable of emitting an optional set of metrics from either the Client or the Worker process.
  
  Learn more
• How to tune Worker performance based on metrics

All metrics are prefixed with temporal_ before being exported to their configured destination. (The prefix has been removed in the following reference.) Currently, some metrics are specific to certain SDKs.

Metrics are defined in the following locations. (Typescript and Python SDK metrics are defined in the Core SDK, and PHP SDK metrics are defined in the Go SDK.)

• Core SDK Worker metrics
• Core SDK Client metrics
• Java SDK Worker metrics
• Java SDK Client metrics
• Go SDK Worker and Client metrics

Each metric may have some combination of the following keys attached to them:

• task-queue: Task Queue that the Worker Entity is polling
• namespace: Namespace the Worker is bound to
• poller_type: One of the following:
  • workflow_task
  • activity_task
  • sticky_workflow_task
• worker_type: One of the following:
  • ActivityWorker
  • WorkflowWorker
  • LocalActivityWorker (Go and Java only)
• activity_type: The name of the Activity Function the metric is associated with
• workflow_type: The name of the Workflow Function the metric is associated with
• operation: RPC method name; available for metrics related to Temporal Client gRPC requests

Some keys may not be available in every SDK, and Histogram metrics may have different buckets in each SDK.

Metric name	Emitted by	Metric type	Availability
activity_execution_cancelled	Worker	Counter	Java
activity_execution_failed	Worker	Counter	TypeScript, Python, Go, PHP, Java
activity_execution_latency	Worker	Histogram	TypeScript, Python, Go, PHP, Java
activity_poll_no_task	Worker	Counter	TypeScript, Python, Go, PHP, Java
activity_schedule_to_start_latency	Worker	Histogram	TypeScript, Python, Go, PHP, Java
activity_task_error	Worker	Counter	Go, PHP
corrupted_signals	Worker	Counter	Go, PHP, Java
local_activity_execution_cancelled	Worker	Counter	Go, PHP, Java
local_activity_execution_failed	Worker	Counter	Go, PHP, Java
local_activity_execution_latency	Worker	Histogram	Go, PHP, Java
local_activity_succeeded_endtoend_latency	Worker	Histogram	Go, PHP, Java
local_activity_total	Worker	Counter	Go, PHP, Java
long_request	Service Client	Counter	TypeScript, Python, Go, PHP, Java
long_request_failure	Service Client	Counter	TypeScript, Python, Go, PHP, Java
long_request_latency	Service Client	Histogram	TypeScript, Python, Go, PHP, Java
num_pollers	Worker	Gauge	TypeScript, Python
poller_start	Worker	Counter	Go, PHP, Java
request	Service Client	Counter	TypeScript, Python, Go, PHP, Java
request_failure	Service Client	Counter	TypeScript, Python, Go, PHP, Java
request_latency	Service Client	Histogram	TypeScript, Python, Go, PHP, Java
sticky_cache_hit	Worker	Counter	TypeScript, Python, Go, PHP, Java
sticky_cache_miss	Worker	Counter	TypeScript, Python, Go, PHP, Java
sticky_cache_size	Worker	Gauge	TypeScript, Python, Go, PHP, Java
sticky_cache_total_forced_eviction	Worker	Counter	Go, PHP, Java
unregistered_activity_invocation	Worker	Counter	Go, PHP
worker_start	Worker	Counter	TypeScript, Python, Go, PHP, Java
worker_task_slots_available	Worker	Gauge	Go, PHP, Java
workflow_active_thread_count	Worker	Gauge	Java
workflow_cancelled	Worker	Counter	TypeScript, Python, Go, PHP, Java
workflow_completed	Worker	Counter	TypeScript, Python, Go, PHP, Java
workflow_continue_as_new	Worker	Counter	TypeScript, Python, Go, PHP, Java
workflow_endtoend_latency	Worker	Histogram	TypeScript, Python, Go, PHP, Java
workflow_failed	Worker	Counter	TypeScript, Python, Go, PHP, Java
workflow_task_execution_failed	Worker	Counter	TypeScript, Python, Go, PHP, Java
workflow_task_execution_latency	Worker	Histogram	TypeScript, Python, Go, PHP, Java
workflow_task_queue_poll_empty	Worker	Counter	TypeScript, Python, Go, PHP, Java
workflow_task_queue_poll_succeed	Worker	Counter	TypeScript, Python, Go, PHP, Java
workflow_task_replay_latency	Worker	Histogram	TypeScript, Python, Go, PHP, Java
workflow_task_schedule_to_start_latency	Worker	Histogram	TypeScript, Python, Go, PHP, Java

activity_execution_cancelled

An Activity Execution was canceled.

• Type: Counter
• Available in: Java
• Tags: activity_type, namespace, task_queue

activity_execution_failed

An Activity Execution failed.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: activity_type, namespace, task_queue

activity_execution_latency

Time to complete an Activity Execution, from the time the Activity Task is generated to the time the language SDK responded with a completion (failure or success).

• Type: Histogram
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: activity_type, namespace, task_queue

activity_poll_no_task

An Activity Worker poll for an Activity Task timed out, and no Activity Task is available to pick from the Task Queue.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: activity_type, namespace, task_queue

activity_schedule_to_start_latency

The Schedule-To-Start time of an Activity Task in milliseconds. A Schedule-To-Start TimeoutWhat is a Schedule-To-Start Timeout?

A Schedule-To-Start Timeout is the maximum amount of time that is allowed from when an Activity Task is placed in a Task Queue to when a Worker picks it up from the Task Queue.

Learn more can be set when an Activity Execution is spawned. This metric is useful for ensuring Activity Tasks are being processed from the queue in a timely manner. Some SDKs may include the activity_type label, but the metric should not vary by type, as it does not influence the rate at which tasks are pulled from the queue.

• Type: Histogram
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue

activity_task_error

An internal error or panic occurred during Activity Task handling or execution.

• Type: Counter
• Available in: Go, PHP
• Tags: activity_type, namespace, task_queue, workflow_type

corrupted_signals

Number of Signals whose payload could not be deserialized.

• Type: Counter
• Available in: Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

local_activity_execution_cancelled

A Local Activity Execution was canceled.

• Type: Counter
• Available in: Go, PHP, Java
• Tags: activity_type, namespace, task_queue

local_activity_execution_failed

A Local Activity Execution failed.

• Type: Counter
• Available in: Go, PHP, Java
• Tags: activity_type, namespace, task_queue

local_activity_execution_latency

Time to complete a Local Activity Execution, from the time the first Activity Task is generated to the time the SDK responds that the execution is complete.

• Type: Histogram
• Available in: Go, PHP, Java
• Tags: activity_type, namespace, task_queue

local_activity_succeeded_endtoend_latency

Total latency of successfully finished Local Activity Executions (from schedule to completion).

• Type: Histogram
• Available in: Go, PHP, Java
• Tags: activity_type, namespace, task_queue

local_activity_total

Total number of Local Activity ExecutionsWhat is a Local Activity?

A Local Activity is an Activity Execution that executes in the same process as the Workflow Execution that spawns it.

Learn more.

• Type: Counter
• Available in: Go, PHP, Java
• Tags: activity_type, namespace, task_queue

long_request

Temporal Client made an RPC long poll request.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, operation

long_request_failure

Temporal Client made an RPC long poll request that failed. This number is included into the total long_request counter for long poll RPC requests.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, operation

long_request_latency

Latency of a Temporal Client gRPC long poll request.

• Type: Histogram
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, operation

num_pollers

Current number of Worker Entities that are polling.

• Type: Gauge
• Available in: TypeScript, Python
• Tags: namespace, poller_type, task_queue

poller_start

A Worker Entity poller was started.

• Type: Counter
• Available in: Go, PHP, Java
• Tags: namespace, task_queue

request

Temporal Client made an RPC request.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, operation

request_failure

Temporal Client made an RPC request that failed. This number is included into the total request counter for RPC requests.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, operation

request_latency

Latency of a Temporal Client gRPC request.

• Type: Histogram
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, operation

sticky_cache_hit

A Workflow Task found a cached Workflow Execution Event History to run against.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue

sticky_cache_miss

A Workflow Task did not find a cached Workflow Worker.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue

sticky_cache_size

Current cache size, expressed in number of Workflow Executions.

• Type: Gauge
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace (TypeScript, Java), task_queue (TypeScript)

sticky_cache_total_forced_eviction

A Workflow Execution has been forced from the cache intentionally.

• Type: Counter
• Available in: Go, PHP, Java
• Tags: namespace, task_queue

unregistered_activity_invocation

A request to spawn an Activity Execution is not registered with the Worker.

• Type: Counter
• Available in: Go, PHP
• Tags: activity_type, namespace, task_queue, workflow_type

worker_start

A Worker Entity has been registered, created, or started.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, worker_type

worker_task_slots_available

The total number of Workflow Task and Activity Task execution slots that are currently available. Use the worker_type key to differentiate execution slots. (Workflow Workers execute Workflow Tasks; Activity Workers execute Activity Tasks.)

• Type: Gauge
• Available in: Go, PHP, Java
• Tags: namespace, task_queue, worker_type

workflow_active_thread_count

Total amount of Workflow threads in the Worker Process.

• Type: Gauge
• Available in: Java

workflow_cancelled

Workflow Execution ended because of a cancellation request.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_completed

A Workflow Execution completed successfully.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_continue_as_new

A Workflow ended with Continue-As-New.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_endtoend_latency

Total Workflow Execution time from schedule to completion for a single Workflow Run. (A retried Workflow Execution is a separate Run.)

• Type: Histogram
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_failed

A Workflow Execution failed.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_task_execution_failed

A Workflow Task Execution failed.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_task_execution_latency

Workflow Task Execution time.

• Type: Histogram
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_task_queue_poll_empty

A Workflow Worker polled a Task Queue and timed out without picking up a Workflow Task.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_task_queue_poll_succeed

A Workflow Worker polled a Task Queue and successfully picked up a Workflow Task.

• Type: Counter
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_task_replay_latency

Time to catch up on replaying a Workflow Task.

• Type: Histogram
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type

workflow_task_schedule_to_start_latency

The Schedule-To-Start time of a Workflow Task.

• Type: Histogram
• Available in: TypeScript, Python, Go, PHP, Java
• Tags: namespace, task_queue, workflow_type