306 lines
8.1 KiB
Markdown
306 lines
8.1 KiB
Markdown
+++
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title = "Monitoring Garage"
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weight = 40
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+++
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Garage exposes some internal metrics in the Prometheus data format.
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This page explains how to exploit these metrics.
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## Setting up monitoring
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### Enabling the Admin API endpoint
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If you have not already enabled the [administration API endpoint](@/documentation/reference-manual/admin-api.md), do so by adding the following lines to your configuration file:
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```toml
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[admin]
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api_bind_addr = "0.0.0.0:3903"
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```
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This will allow anyone to scrape Prometheus metrics by fetching
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`http://localhost:3093/metrics`. If you want to restrict access
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to the exported metrics, set the `metrics_token` configuration value
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to a bearer token to be used when fetching the metrics endpoint.
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### Setting up Prometheus and Grafana
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Add a scrape config to your Prometheus daemon to scrape metrics from
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all of your nodes:
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```yaml
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scrape_configs:
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- job_name: 'garage'
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static_configs:
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- targets:
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- 'node1.mycluster:3903'
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- 'node2.mycluster:3903'
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- 'node3.mycluster:3903'
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```
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If you have set a metrics token in your Garage configuration file,
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add the following lines in your Prometheus scrape config:
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```yaml
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authorization:
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type: Bearer
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credentials: 'your metrics token'
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```
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To visualize the scraped data in Grafana,
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you can either import our [Grafana dashboard for Garage](https://git.deuxfleurs.fr/Deuxfleurs/garage/raw/branch/main/script/telemetry/grafana-garage-dashboard-prometheus.json)
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or make your own.
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We detail below the list of exposed metrics and their meaning.
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## List of exported metrics
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### API endpoints
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#### `api_admin_request_counter` (counter)
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Counts the number of requests to a given endpoint of the administration API. Example:
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```
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api_admin_request_counter{api_endpoint="Metrics"} 127041
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```
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#### `api_admin_request_duration` (histogram)
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Evaluates the duration of API calls to the various administration API endpoint. Example:
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```
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api_admin_request_duration_bucket{api_endpoint="Metrics",le="0.5"} 127041
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api_admin_request_duration_sum{api_endpoint="Metrics"} 605.250344830999
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api_admin_request_duration_count{api_endpoint="Metrics"} 127041
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```
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#### `api_s3_request_counter` (counter)
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Counts the number of requests to a given endpoint of the S3 API. Example:
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```
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api_s3_request_counter{api_endpoint="CreateMultipartUpload"} 1
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```
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#### `api_s3_error_counter` (counter)
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Counts the number of requests to a given endpoint of the S3 API that returned an error. Example:
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```
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api_s3_error_counter{api_endpoint="GetObject",status_code="404"} 39
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```
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#### `api_s3_request_duration` (histogram)
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Evaluates the duration of API calls to the various S3 API endpoints. Example:
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```
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api_s3_request_duration_bucket{api_endpoint="CreateMultipartUpload",le="0.5"} 1
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api_s3_request_duration_sum{api_endpoint="CreateMultipartUpload"} 0.046340762
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api_s3_request_duration_count{api_endpoint="CreateMultipartUpload"} 1
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```
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#### `api_k2v_request_counter` (counter), `api_k2v_error_counter` (counter), `api_k2v_error_duration` (histogram)
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Same as for S3, for the K2V API.
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### Web endpoint
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#### `web_request_counter` (counter)
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Number of requests to the web endpoint
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```
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web_request_counter{method="GET"} 80
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```
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#### `web_request_duration` (histogram)
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Duration of requests to the web endpoint
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```
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web_request_duration_bucket{method="GET",le="0.5"} 80
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web_request_duration_sum{method="GET"} 1.0528433229999998
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web_request_duration_count{method="GET"} 80
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```
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#### `web_error_counter` (counter)
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Number of requests to the web endpoint resulting in errors
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```
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web_error_counter{method="GET",status_code="404 Not Found"} 64
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```
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### Data block manager
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#### `block_bytes_read`, `block_bytes_written` (counter)
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Number of bytes read/written to/from disk in the data storage directory.
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```
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block_bytes_read 120586322022
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block_bytes_written 3386618077
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```
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#### `block_read_duration`, `block_write_duration` (histograms)
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Evaluates the duration of the reading/writing of individual data blocks in the data storage directory.
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```
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block_read_duration_bucket{le="0.5"} 169229
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block_read_duration_sum 2761.6902550310056
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block_read_duration_count 169240
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block_write_duration_bucket{le="0.5"} 3559
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block_write_duration_sum 195.59170078500006
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block_write_duration_count 3571
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```
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#### `block_delete_counter` (counter)
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Counts the number of data blocks that have been deleted from storage.
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```
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block_delete_counter 122
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```
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#### `block_resync_counter` (counter), `block_resync_duration` (histogram)
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Counts the number of resync operations the node has executed, and evaluates their duration.
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```
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block_resync_counter 308897
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block_resync_duration_bucket{le="0.5"} 308892
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block_resync_duration_sum 139.64204196100016
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block_resync_duration_count 308897
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```
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#### `block_resync_queue_length` (gauge)
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The number of block hashes currently queued for a resync.
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This is normal to be nonzero for long periods of time.
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```
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block_resync_queue_length 0
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```
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#### `block_resync_errored_blocks` (gauge)
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The number of block hashes that we were unable to resync last time we tried.
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**THIS SHOULD BE ZERO, OR FALL BACK TO ZERO RAPIDLY, IN A HEALTHY CLUSTER.**
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```
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block_resync_errored_blocks 0
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```
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### RPC (remote procedure calls) between nodes
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#### `rpc_netapp_request_counter` (counter)
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Number of RPC requests emitted
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```
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rpc_request_counter{from="<this node>",rpc_endpoint="garage_block/manager.rs/Rpc",to="<remote node>"} 176
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```
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#### `rpc_netapp_error_counter` (counter)
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Number of communication errors (errors in the Netapp library)
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```
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rpc_netapp_error_counter{from="<this node>",rpc_endpoint="garage_block/manager.rs/Rpc",to="<remote node>"} 354
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```
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#### `rpc_timeout_counter` (counter)
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Number of RPC timeouts
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```
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rpc_timeout_counter{from="<this node>",rpc_endpoint="garage_rpc/membership.rs/SystemRpc",to="<remote node>"} 1
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```
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#### `rpc_duration` (histogram)
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The duration of internal RPC calls between Garage nodes.
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```
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rpc_duration_bucket{from="<this node>",rpc_endpoint="garage_block/manager.rs/Rpc",to="<remote node>",le="0.5"} 166
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rpc_duration_sum{from="<this node>",rpc_endpoint="garage_block/manager.rs/Rpc",to="<remote node>"} 35.172253716
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rpc_duration_count{from="<this node>",rpc_endpoint="garage_block/manager.rs/Rpc",to="<remote node>"} 174
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```
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### Metadata table manager
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#### `table_gc_todo_queue_length` (gauge)
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Table garbage collector TODO queue length
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```
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table_gc_todo_queue_length{table_name="block_ref"} 0
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```
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#### `table_get_request_counter` (counter), `table_get_request_duration` (histogram)
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Number of get/get_range requests internally made on each table, and their duration.
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```
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table_get_request_counter{table_name="bucket_alias"} 315
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table_get_request_duration_bucket{table_name="bucket_alias",le="0.5"} 315
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table_get_request_duration_sum{table_name="bucket_alias"} 0.048509778000000024
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table_get_request_duration_count{table_name="bucket_alias"} 315
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```
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#### `table_put_request_counter` (counter), `table_put_request_duration` (histogram)
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Number of insert/insert_many requests internally made on this table, and their duration
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```
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table_put_request_counter{table_name="block_ref"} 677
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table_put_request_duration_bucket{table_name="block_ref",le="0.5"} 677
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table_put_request_duration_sum{table_name="block_ref"} 61.617528636
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table_put_request_duration_count{table_name="block_ref"} 677
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```
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#### `table_internal_delete_counter` (counter)
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Number of value deletions in the tree (due to GC or repartitioning)
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```
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table_internal_delete_counter{table_name="block_ref"} 2296
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```
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#### `table_internal_update_counter` (counter)
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Number of value updates where the value actually changes (includes creation of new key and update of existing key)
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```
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table_internal_update_counter{table_name="block_ref"} 5996
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```
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#### `table_merkle_updater_todo_queue_length` (gauge)
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Merkle tree updater TODO queue length (should fall to zero rapidly)
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```
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table_merkle_updater_todo_queue_length{table_name="block_ref"} 0
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```
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#### `table_sync_items_received`, `table_sync_items_sent` (counters)
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Number of data items sent to/recieved from other nodes during resync procedures
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```
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table_sync_items_received{from="<remote node>",table_name="bucket_v2"} 3
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table_sync_items_sent{table_name="block_ref",to="<remote node>"} 2
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```
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