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