Feat: Hatchet Metrics Monitoring, I (#2480)

* feat: queries + task methods for oldest running task and oldest task

* feat: worker slot and sdk metrics

* feat: wal metrics

* repository stub

* feat: add meter provider thingy

* pg queries

* fix: add task

* feat: repo methods for worker metrics

* feat: active workers query, fix where clauses

* fix: aliasing

* fix: sql, cleanup

* chore: cast

* feat: olap queries

* feat: olap queries

* feat: finish wiring up olap status update metrics

* chore: lint

* chore: lint

* fix: dupes, other code review comments

* send metrics to OTel collector

* last autovac

* flag

* logging updates

* address PR comments

---------

Co-authored-by: gabriel ruttner <gabriel.ruttner@gmail.com>
Co-authored-by: Mohammed Nafees <hello@mnafees.me>

sql/schema/pg-stubs.sql

@@ -0,0 +1,109 @@
+--  these are stub views to satisfy the sqlc generator for pg features
+
+CREATE VIEW pg_stat_user_tables AS
+SELECT
+    NULL::oid AS relid,
+    NULL::name AS schemaname,
+    NULL::name AS relname,
+    NULL::bigint AS seq_scan,
+    NULL::bigint AS seq_tup_read,
+    NULL::bigint AS idx_scan,
+    NULL::bigint AS idx_tup_fetch,
+    NULL::bigint AS n_tup_ins,
+    NULL::bigint AS n_tup_upd,
+    NULL::bigint AS n_tup_del,
+    NULL::bigint AS n_tup_hot_upd,
+    NULL::bigint AS n_live_tup,
+    NULL::bigint AS n_dead_tup,
+    NULL::bigint AS n_mod_since_analyze,
+    NULL::bigint AS n_ins_since_vacuum,
+    NULL::bigint AS vacuum_count,
+    NULL::bigint AS autovacuum_count,
+    NULL::bigint AS analyze_count,
+    NULL::bigint AS autoanalyze_count,
+    NULL::timestamp with time zone AS last_vacuum,
+    NULL::timestamp with time zone AS last_autovacuum,
+    NULL::timestamp with time zone AS last_analyze,
+    NULL::timestamp with time zone AS last_autoanalyze
+WHERE
+    false;
+
+CREATE VIEW pg_statio_user_tables AS
+SELECT
+    NULL::oid AS relid,
+    NULL::name AS schemaname,
+    NULL::name AS relname,
+    NULL::bigint AS heap_blks_read,
+    NULL::bigint AS heap_blks_hit,
+    NULL::bigint AS idx_blks_read,
+    NULL::bigint AS idx_blks_hit,
+    NULL::bigint AS toast_blks_read,
+    NULL::bigint AS toast_blks_hit,
+    NULL::bigint AS tidx_blks_read,
+    NULL::bigint AS tidx_blks_hit
+WHERE
+    false;
+
+CREATE VIEW pg_available_extensions AS
+SELECT
+    NULL::name AS name,
+    NULL::text AS default_version,
+    NULL::text AS installed_version,
+    NULL::text AS comment
+WHERE
+    false;
+
+CREATE VIEW pg_stat_statements AS
+SELECT
+    NULL::oid AS userid,
+    NULL::oid AS dbid,
+    NULL::bigint AS queryid,
+    NULL::text AS query,
+    NULL::bigint AS calls,
+    NULL::double precision AS total_exec_time,
+    NULL::bigint AS rows,
+    NULL::bigint AS shared_blks_hit,
+    NULL::bigint AS shared_blks_read,
+    NULL::bigint AS shared_blks_dirtied,
+    NULL::bigint AS shared_blks_written,
+    NULL::bigint AS local_blks_hit,
+    NULL::bigint AS local_blks_read,
+    NULL::bigint AS local_blks_dirtied,
+    NULL::bigint AS local_blks_written,
+    NULL::bigint AS temp_blks_read,
+    NULL::bigint AS temp_blks_written,
+    NULL::double precision AS blk_read_time,
+    NULL::double precision AS blk_write_time
+WHERE
+    false;
+
+CREATE VIEW pg_stat_progress_vacuum AS
+SELECT
+    NULL::integer AS pid,
+    NULL::oid AS datid,
+    NULL::name AS datname,
+    NULL::oid AS relid,
+    NULL::text AS phase,
+    NULL::bigint AS heap_blks_total,
+    NULL::bigint AS heap_blks_scanned,
+    NULL::bigint AS heap_blks_vacuumed,
+    NULL::bigint AS heap_blks_frozen,
+    NULL::bigint AS index_vacuum_count,
+    NULL::bigint AS max_dead_tuples,
+    NULL::bigint AS num_dead_tuples
+WHERE
+    false;
+
+CREATE VIEW pg_stat_activity AS
+SELECT
+    NULL::integer AS pid,
+    NULL::name AS usename,
+    NULL::text AS application_name,
+    NULL::inet AS client_addr,
+    NULL::text AS state,
+    NULL::timestamp with time zone AS query_start,
+    NULL::text AS wait_event_type,
+    NULL::text AS wait_event,
+    NULL::text AS query
+WHERE
+    false;