# Metrics Reference
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This page applies to Feast 0.7. The content may be out of date for Feast 0.8+
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Reference of the metrics that each Feast component exports:
* [Feast Core](#feast-core)
* [Feast Serving](#feast-serving)
* [Feast Ingestion Job](#feast-ingestion-job)
For how to configure Feast to export Metrics, see the [Metrics user guide.](https://docs.feast.dev/v0.11-branch/feast-on-kubernetes/advanced-1/metrics)
## 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.](https://docs.feast.dev/v0.11-branch/user-guide/getting-training-features#online-field-statuses) | `project`, `feature_name` |
| `feast_serving_stale_feature_count` | No. of requests retrieving a Feature resulted in a [`OUTSIDE_MAX_AGE` field status.](https://docs.feast.dev/v0.11-branch/user-guide/getting-training-features#online-field-statuses) | `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.](https://docs.feast.dev/v0.11-branch/feast-on-kubernetes/user-guide/define-and-ingest-features) 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` |