Metrics Reference

This page applies to Feast 0.7. The content may be out of date for Feast 0.8+

Reference of the metrics that each Feast component exports:

• Feast Core

• Feast Serving

• Feast Ingestion Job

For how to configure Feast to export Metrics, see the Metrics user guide.

Feast Core

Exported Metrics

Feast Core exports the following metrics:

Metrics	Description	Tags
feast_core_request_latency_seconds	Feast Core's latency in serving Requests in Seconds.	service, method, status_code
feast_core_feature_set_total	No. of Feature Sets registered with Feast Core.	None
feast_core_store_total	No. of Stores registered with Feast Core.	None
feast_core_max_memory_bytes	Max amount of memory the Java virtual machine will attempt to use.	None
feast_core_total_memory_bytes	Total amount of memory in the Java virtual machine	None
feast_core_free_memory_bytes	Total amount of free memory in the Java virtual machine.	None
feast_core_gc_collection_seconds	Time spent in a given JVM garbage collector in seconds.	None

Metric Tags

Exported Feast Core metrics may be filtered by the following tags/keys

Tag	Description
service	Name of the Service that request is made to. Should be set to CoreService
method	Name of the Method that the request is calling. (ie ListFeatureSets)
status_code	Status code returned as a result of handling the requests (ie OK). Can be used to find request failures.

Feast Serving

Exported Metrics

Feast Serving exports the following metrics:

Metric	Description	Tags
feast_serving_request_latency_seconds	Feast Serving's latency in serving Requests in Seconds.	method
feast_serving_request_feature_count	No. of requests retrieving a Feature from Feast Serving.	project, feature_name
feast_serving_not_found_feature_count	No. of requests retrieving a Feature has resulted in a NOT_FOUND field status.	project, feature_name
feast_serving_stale_feature_count	No. of requests retrieving a Feature resulted in a OUTSIDE_MAX_AGE field status.	project, feature_name
feast_serving_grpc_request_count	Total gRPC requests served.	method

Metric Tags

Exported Feast Serving metrics may be filtered by the following tags/keys

Tag	Description
method	Name of the Method that the request is calling. (ie ListFeatureSets)
status_code	Status code returned as a result of handling the requests (ie OK). Can be used to find request failures.
project	Name of the project that the FeatureSet of the Feature retrieved belongs to.
feature_name	Name of the Feature being retrieved.

Feast Ingestion Job

Feast Ingestion computes both metrics an statistics on data ingestion. Make sure you familar with data ingestion concepts before proceeding.

Metrics Namespace

Metrics are computed at two stages of the Feature Row's/Feature Value's life cycle when being processed by the Ingestion Job:

• Inflight- Prior to writing data to stores, but after successful validation of data.

• WriteToStoreSucess- After a successful store write.

Metrics processed by each staged will be tagged with metrics_namespace to the stage where the metric was computed.

Metrics Bucketing

Metrics with a {BUCKET} are computed on a 60 second window/bucket. Suffix with the following to select the bucket to use:

• min - minimum value.

• max - maximum value.

• mean- mean value.

• percentile_90- 90 percentile.

• percentile_95- 95 percentile.

• percentile_99- 99 percentile.

Exported Metrics

Metric	Description	Tags
feast_ingestion_feature_row_lag_ms_{BUCKET}	Lag time in milliseconds between succeeding ingested Feature Rows.	feast_store, feast_project_name,feast_featureSet_name,ingestion_job_name, metrics_namespace
feast_ingestion_feature_value_lag_ms_{BUCKET}	Lag time in milliseconds between succeeding ingested values for each Feature.	feast_store, feast_project_name,feast_featureSet_name, feast_feature_name, ingestion_job_name, metrics_namespace
feast_ingestion_feature_value_{BUCKET}	Last value feature for each Feature.	feast_store, feature_project_name, feast_feature_name,feast_featureSet_name, ingest_job_name, metrics_namepace
feast_ingestion_feature_row_ingested_count	No. of Ingested Feature Rows	feast_store, feast_project_name,feast_featureSet_name,ingestion_job_name, metrics_namespace
feast_ingestion_feature_value_missing_count	No. of times a ingested Feature values did not provide a value for the Feature.	feast_store, feast_project_name,feast_featureSet_name, feast_feature_name, ingestion_job_name, metrics_namespace
feast_ingestion_deadletter_row_count	No. of Feature Rows that that the Ingestion Job did not successfully write to store.	feast_store, feast_project_name,feast_featureSet_name,ingestion_job_name

Metric Tags

Exported Feast Ingestion Job metrics may be filtered by the following tags/keys

Tag	Description
feast_store	Name of the target store the Ingestion Job is writing to.
feast_project_name	Name of the project that the ingested FeatureSet belongs to.
feast_featureSet_name	Name of the Feature Set being ingested.
feast_feature_name	Name of the Feature being ingested.
ingestion_job_name	Name of the Ingestion Job performing data ingestion. Typically this is set to the Id of the Ingestion Job.
metrics_namespace	Stage where metrics where computed. Either Inflight or WriteToStoreSuccess