mirror of
git://git.savannah.gnu.org/guix/data-service.git
synced 2023-12-14 03:23:03 +01:00
9e9fc1ba04
As data.qa.guix.gnu.org has lots of branches and 100,000+ metrics, and this is causing Prometheus to time out fetching the metrics. I'm not sure there's much value in these metrics, so cut them out for now.
178 lines
6.9 KiB
Scheme
178 lines
6.9 KiB
Scheme
;;; Guix Data Service -- Information about Guix over time
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;;; Copyright © 2020 Christopher Baines <mail@cbaines.net>
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;;;
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;;; This program is free software: you can redistribute it and/or
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;;; modify it under the terms of the GNU Affero General Public License
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;;; as published by the Free Software Foundation, either version 3 of
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;;; the License, or (at your option) any later version.
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;;;
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;;; This program is distributed in the hope that it will be useful,
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;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;; Affero General Public License for more details.
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;;;
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;;; You should have received a copy of the GNU Affero General Public
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;;; License along with this program. If not, see
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;;; <http://www.gnu.org/licenses/>.
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(define-module (guix-data-service metrics)
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#:use-module (ice-9 match)
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#:use-module (squee)
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#:export (fetch-high-level-table-size-metrics
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fetch-pg-stat-user-tables-metrics
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fetch-pg-stat-user-indexes-metrics
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fetch-pg-stats-metrics))
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(define (fetch-high-level-table-size-metrics conn)
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;; Adapted from https://wiki.postgresql.org/wiki/Disk_Usage
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(define query
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"
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WITH RECURSIVE pg_inherit(inhrelid, inhparent) AS (
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SELECT inhrelid, inhparent
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FROM pg_inherits
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UNION
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SELECT child.inhrelid, parent.inhparent
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FROM pg_inherit child, pg_inherits parent
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WHERE child.inhparent = parent.inhrelid
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), pg_inherit_short AS (
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SELECT *
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FROM pg_inherit
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WHERE inhparent NOT IN (SELECT inhrelid FROM pg_inherit)
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)
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SELECT table_name,
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COALESCE(pg_tablespace.spcname,'default') AS tablespace,
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row_estimate,
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table_bytes,
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toast_bytes
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FROM (
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SELECT *, total_bytes-index_bytes-COALESCE(toast_bytes,0) AS table_bytes
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FROM (
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SELECT c.oid,
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nspname AS table_schema,
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relname AS table_name,
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reltablespace AS tablespace_id,
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SUM(c.reltuples) OVER (partition BY parent) AS row_estimate,
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SUM(pg_total_relation_size(c.oid)) OVER (partition BY parent) AS total_bytes,
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SUM(pg_indexes_size(c.oid)) OVER (partition BY parent) AS index_bytes,
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SUM(pg_total_relation_size(reltoastrelid)) OVER (partition BY parent) AS toast_bytes,
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parent
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FROM (
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SELECT pg_class.oid,
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reltuples,
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relname,
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relnamespace,
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reltablespace,
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pg_class.reltoastrelid,
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COALESCE(inhparent, pg_class.oid) parent
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FROM pg_class
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LEFT JOIN pg_inherit_short ON inhrelid = oid
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WHERE relkind IN ('r', 'p')
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) c
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LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
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) a
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WHERE oid = parent
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AND table_schema = 'guix_data_service'
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) a
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LEFT JOIN pg_tablespace ON tablespace_id = pg_tablespace.oid")
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(map (match-lambda
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((name tablespace row-estimate table-bytes toast-bytes)
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(list name
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tablespace
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(or (string->number (or row-estimate "")) 0)
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(or (string->number (or table-bytes "")) 0)
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(or (string->number (or toast-bytes "")) 0))))
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(exec-query conn query)))
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(define (fetch-pg-stat-user-tables-metrics conn)
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(define query
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"
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SELECT relname, seq_scan, seq_tup_read,
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COALESCE(idx_scan, 0), COALESCE(idx_tup_fetch, 0),
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n_tup_ins, n_tup_upd, n_tup_del, n_tup_hot_upd,
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n_live_tup, n_dead_tup, n_mod_since_analyze,
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COALESCE(extract(epoch from last_vacuum), 0),
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COALESCE(extract(epoch from last_autovacuum), 0),
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COALESCE(extract(epoch from last_analyze), 0),
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COALESCE(extract(epoch from last_autoanalyze), 0),
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vacuum_count, autovacuum_count, analyze_count, autoanalyze_count
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FROM pg_stat_user_tables
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WHERE relname NOT LIKE 'package_derivations_by_guix_revision_range_git_branch_%'")
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(map (match-lambda
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((relname seq-scan seq-tup-read
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idx-scan idx-tup-fetch
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n-tup-ins n-tup-upd n-tup-del n-tup-hot-upd
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n-live-tup n-dead-tup n-mod-since-analyze
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last-vacuum last-autovacuum last-analyze last-autoanalyze
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vacuum-count autovacuum-count analyze-count autoanalyze-count)
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`((name . ,relname)
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(seq-scan . ,seq-scan)
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(seq-tup-read . ,seq-tup-read)
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(idx-scan . ,idx-scan)
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(idx-tup-fetch . ,idx-tup-fetch)
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(n-tup-ins . ,n-tup-ins)
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(n-tup-upd . ,n-tup-upd)
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(n-tup-del . ,n-tup-del)
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(n-tup-hot-upd . ,n-tup-hot-upd)
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(n-live-tup . ,n-live-tup)
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(n-dead-tup . ,n-dead-tup)
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(n-mod-since-analyze . ,n-mod-since-analyze)
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(last-vacuum . ,last-vacuum)
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(last-autovacuum . ,last-autovacuum)
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(last-analyze . ,last-analyze)
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(last-autoanalyze . ,last-autoanalyze)
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(vacuum-count . ,vacuum-count)
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(autovacuum-count . ,autovacuum-count)
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(analyze-count . ,analyze-count)
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(autoanalyze-count . ,autoanalyze-count))))
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(exec-query conn query)))
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(define (fetch-pg-stat-user-indexes-metrics conn)
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(define query
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"
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SELECT pg_indexes.indexname,
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pg_indexes.tablename,
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COALESCE(pg_indexes.tablespace,'default') AS tablespace,
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pg_stat_user_indexes.idx_scan,
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pg_stat_user_indexes.idx_tup_read,
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pg_stat_user_indexes.idx_tup_fetch,
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pg_relation_size(indexrelid) AS size_in_bytes
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FROM pg_stat_user_indexes
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LEFT JOIN pg_indexes
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ON pg_stat_user_indexes.indexrelname = pg_indexes.indexname
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AND pg_stat_user_indexes.schemaname = pg_indexes.schemaname
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WHERE pg_stat_user_indexes.schemaname = 'guix_data_service'
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AND pg_indexes.tablename NOT LIKE 'package_derivations_by_guix_revision_range_git_branch_%'")
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(map
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(match-lambda
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((indexname tablename tablespace
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idx_scan idx_tup_read idx_tup_fetch
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size_in_bytes)
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`((name . ,indexname)
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(table-name . ,tablename)
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(tablespace . ,tablespace)
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(idx-scan . ,idx_scan)
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(idx-tup-read . ,idx_tup_read)
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(idx-tup-fetch . ,idx_tup_fetch)
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(bytes . ,size_in_bytes))))
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(exec-query conn query)))
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(define (fetch-pg-stats-metrics conn)
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(define query
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"
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SELECT tablename, attname, null_frac, n_distinct, correlation
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FROM pg_stats
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WHERE schemaname = 'guix_data_service'
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AND tablename NOT LIKE 'package_derivations_by_guix_revision_range_git_branch_%'")
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(map
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(match-lambda
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((tablename attname null_frac n_distinct correlation)
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`((table-name . ,tablename)
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(column-name . ,attname)
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(null-frac . ,(string->number null_frac))
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(n-distinct . ,(string->number n_distinct))
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(correlation . ,(and=> correlation string->number)))))
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(exec-query conn query)))
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