8b43609920
Shard-level latencies generate a lot of metrics. This patch reduces the the number of latencies reported by Alternator while keeping the same functionality. On the shard level, summaries will be reported instead of histograms. On the instance level, an aggregated histogram will be reported. Summaries, histograms, and counters are marked with skip_when_empty. Fixes #12230 Closes scylladb/scylladb#17581
92 lines
3.1 KiB
C++
92 lines
3.1 KiB
C++
/*
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* Copyright 2019-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <cstdint>
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#include <seastar/core/metrics_registration.hh>
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#include "utils/estimated_histogram.hh"
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#include "utils/histogram.hh"
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#include "cql3/stats.hh"
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namespace alternator {
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// Object holding per-shard statistics related to Alternator.
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// While this object is alive, these metrics are also registered to be
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// visible by the metrics REST API, with the "alternator" prefix.
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class stats {
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public:
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stats();
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// Count of DynamoDB API operations by types
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struct {
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uint64_t batch_get_item = 0;
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uint64_t batch_write_item = 0;
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uint64_t create_backup = 0;
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uint64_t create_global_table = 0;
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uint64_t create_table = 0;
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uint64_t delete_backup = 0;
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uint64_t delete_item = 0;
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uint64_t delete_table = 0;
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uint64_t describe_backup = 0;
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uint64_t describe_continuous_backups = 0;
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uint64_t describe_endpoints = 0;
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uint64_t describe_global_table = 0;
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uint64_t describe_global_table_settings = 0;
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uint64_t describe_limits = 0;
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uint64_t describe_table = 0;
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uint64_t describe_time_to_live = 0;
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uint64_t get_item = 0;
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uint64_t list_backups = 0;
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uint64_t list_global_tables = 0;
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uint64_t list_tables = 0;
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uint64_t list_tags_of_resource = 0;
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uint64_t put_item = 0;
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uint64_t query = 0;
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uint64_t restore_table_from_backup = 0;
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uint64_t restore_table_to_point_in_time = 0;
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uint64_t scan = 0;
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uint64_t tag_resource = 0;
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uint64_t transact_get_items = 0;
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uint64_t transact_write_items = 0;
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uint64_t untag_resource = 0;
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uint64_t update_continuous_backups = 0;
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uint64_t update_global_table = 0;
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uint64_t update_global_table_settings = 0;
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uint64_t update_item = 0;
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uint64_t update_table = 0;
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uint64_t update_time_to_live = 0;
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uint64_t list_streams = 0;
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uint64_t describe_stream = 0;
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uint64_t get_shard_iterator = 0;
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uint64_t get_records = 0;
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utils::timed_rate_moving_average_summary_and_histogram put_item_latency;
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utils::timed_rate_moving_average_summary_and_histogram get_item_latency;
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utils::timed_rate_moving_average_summary_and_histogram delete_item_latency;
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utils::timed_rate_moving_average_summary_and_histogram update_item_latency;
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utils::timed_rate_moving_average_summary_and_histogram get_records_latency;
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} api_operations;
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// Miscellaneous event counters
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uint64_t total_operations = 0;
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uint64_t unsupported_operations = 0;
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uint64_t reads_before_write = 0;
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uint64_t write_using_lwt = 0;
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uint64_t shard_bounce_for_lwt = 0;
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uint64_t requests_blocked_memory = 0;
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uint64_t requests_shed = 0;
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// CQL-derived stats
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cql3::cql_stats cql_stats;
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private:
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// The metric_groups object holds this stat object's metrics registered
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// as long as the stats object is alive.
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seastar::metrics::metric_groups _metrics;
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};
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}
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