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diff --git a/doc/book/cookbook/monitoring.md b/doc/book/cookbook/monitoring.md new file mode 100644 index 00000000..8206f645 --- /dev/null +++ b/doc/book/cookbook/monitoring.md @@ -0,0 +1,306 @@ ++++ +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 +``` + + |