Metrics
Overview
Every Golem service exposes Prometheus metrics on its HTTP interface. The metrics are available at the /metrics endpoint for scraping.
Beside the service-specific metrics each service exports a single counter called version_info in which the labels hold service-specific information.
The currently available labels are:
| Label | Description |
|---|---|
version | The version of the service |
Service-specific metrics
Component Service
Component service exposes the following Prometheus metrics:
| Metric | Type | Labels | Description |
|---|---|---|---|
poem_request_count | counter | http.request.method, url.full, [http.path_pattern], http.response.status_code, exception.message | Counts every request on the HTTP interface |
poem_errors_count | counter | http.request.method, url.full, [http.path_pattern], http.response.status_code, exception.message | Counts failed requests on the HTTP interface |
poem_request_duration_ms | histogram | http.request.method, url.full, [http.path_pattern], http.response.status_code, exception.message | Measures the duration of handling requests on the HTTP interface |
api_success_seconds | histogram | api, api_type | Measures the duration of successfully serving API requests (both HTTP and gRPC) |
api_failure_seconds | histogram | api, api_type | Measures the duration of failed API requests (both HTTP and gRPC) |
grpc_api_active_streams | gauge | Number of open incoming gRPC streams | |
http_api_active_streams | gauge | Number of open incoming HTTP streams |
Component Compilation Service
Component compilation service exposes the following Prometheus metrics:
| Metric | Type | Labels | Description |
|---|---|---|---|
cache_size | gauge | cache | Current maximal capacity of the cache |
cache_hit_total | counter | cache | Number of cache hits |
cache_miss_total | counter | cache | Number of cache misses |
cache_eviction_total | counter | cache, trigger | Number of cache evictions |
component_compilation_queue_length | gauge | Number of compilation requests enqueued | |
compilation_time_seconds | histogram | Time to compile a WASM compnent to native code |
Shard Manager
Shard manager exposes the following Prometheus metrics:
| Metric | Type | Labels | Description |
|---|---|---|---|
api_success_seconds | histogram | api, api_type | Measures the duration of successfully serving API requests (both HTTP and gRPC) |
api_failure_seconds | histogram | api, api_type | Measures the duration of failed API requests (both HTTP and gRPC) |
grpc_api_active_streams | gauge | Number of open incoming gRPC streams | |
http_api_active_streams | gauge | Number of open incoming HTTP streams | |
external_call_success_seconds | histogram | target, op | Dureation of successful outgoing calls |
external_call_response_size_bytes | histogram | target, op | Size of the response of outgoing calls |
external_call_retry_total | counter | target, op | Number of failed outgoing calls that got retried |
external_call_failure_total | counter | target, op | Number of failed outgoing calls not to be retried |
redis_success_seconds | histogram | svc, api, cmd | Duration of successful Redis calls |
redis_failure_total | counter | svc, api, cmd | Number of failed Redis calls |
redis_serialized_size_bytes | histogram | svc, entity | Size of serialized Redis entities |
redis_deserialized_size_bytes | histogram | svc, entity | Size of deserialized Redis entities |
Worker Executor
Worker executors expose the following Prometheus metrics:
| Metric | Type | Labels | Description |
|---|---|---|---|
api_success_seconds | histogram | api, api_type | Measures the duration of successfully serving API requests (both HTTP and gRPC) |
api_failure_seconds | histogram | api, api_type | Measures the duration of failed API requests (both HTTP and gRPC) |
grpc_api_active_streams | gauge | Number of open incoming gRPC streams | |
http_api_active_streams | gauge | Number of open incoming HTTP streams | |
external_call_success_seconds | histogram | target, op | Dureation of successful outgoing calls |
external_call_response_size_bytes | histogram | target, op | Size of the response of outgoing calls |
external_call_retry_total | counter | target, op | Number of failed outgoing calls that got retried |
external_call_failure_total | counter | target, op | Number of failed outgoing calls not to be retried |
redis_success_seconds | histogram | svc, api, cmd | Duration of successful Redis calls |
redis_failure_total | counter | svc, api, cmd | Number of failed Redis calls |
redis_serialized_size_bytes | histogram | svc, entity | Size of serialized Redis entities |
redis_deserialized_size_bytes | histogram | svc, entity | Size of deserialized Redis entities |
cache_size | gauge | cache | Current maximal capacity of the cache |
cache_hit_total | counter | cache | Number of cache hits |
cache_miss_total | counter | cache | Number of cache misses |
cache_eviction_total | counter | cache, trigger | Number of cache evictions |
compilation_time_seconds | histogram | Time to compile a WASM compnent to native code | |
event_total | counter | event | Number of events produced by workers |
event_broadcast_total | counter | event | Number of events broadcasted by the executor |
worker_executor_call_total | counter | api | Number of calls to the worker layer |
promises_count_total | counter | Number of promises created | |
promises_scheduled_complete_total | counter | Number of scheduled promise completions | |
assigned_shard_count | gauge | Number of assigned shards | |
create_worker_seconds | histogram | Time to create a new worker | |
create_worker_failure_total | counter | error | Number of failed worker creations |
invocation_total | counter | mode, outcome | Number of invocations |
invocation_consumption_total | histogram | Amount of fuel consumed by an invocation | |
allocated_memory_bytes | histogram | Amount of memory allocated by a single memory.grow instruction | |
host_function_call_total | counter | interface, name | Number of calls to specific host functions |
resume_worker_seconds | histogram | Time taken to resume a worker | |
replayed_functions_count | histogram | Number of functions replayed per forker resumption | |
oplog_svc_call_total | counter | api | Number of calls to the oplog layer |
Worker Service
Worker service exposes the following Prometheus metrics:
| Metric | Type | Labels | Description |
|---|---|---|---|
poem_request_count | counter | http.request.method, url.full, [http.path_pattern], http.response.status_code, exception.message | Counts every request on the HTTP interface |
poem_errors_count | counter | http.request.method, url.full, [http.path_pattern], http.response.status_code, exception.message | Counts failed requests on the HTTP interface |
poem_request_duration_ms | histogram | http.request.method, url.full, [http.path_pattern], http.response.status_code, exception.message | Measures the duration of handling requests on the HTTP interface |
api_success_seconds | histogram | api, api_type | Measures the duration of successfully serving API requests (both HTTP and gRPC) |
api_failure_seconds | histogram | api, api_type | Measures the duration of failed API requests (both HTTP and gRPC) |
grpc_api_active_streams | gauge | Number of open incoming gRPC streams | |
http_api_active_streams | gauge | Number of open incoming HTTP streams | |
external_call_success_seconds | histogram | target, op | Dureation of successful outgoing calls |
external_call_response_size_bytes | histogram | target, op | Size of the response of outgoing calls |
external_call_retry_total | counter | target, op | Number of failed outgoing calls that got retried |
external_call_failure_total | counter | target, op | Number of failed outgoing calls not to be retried |
cache_size | gauge | cache | Current maximal capacity of the cache |
cache_hit_total | counter | cache | Number of cache hits |
cache_miss_total | counter | cache | Number of cache misses |
cache_eviction_total | counter | cache, trigger | Number of cache evictions |