Metrics Reference

AngaraBase exports Prometheus metrics on the /metrics endpoint (default port 9898, set via [ops] metrics_addr). All metric names are prefixed with angarabase_.

Replaces: docs/registries/metrics_surface_inventory_v0.txt (now deprecated).

Metric Types

Type	Prometheus Kind	Description
`Gauge`	`gauge`	Point-in-time value that can go up or down
`Counter`	`counter`	Monotonically increasing value (always use `rate()` or `increase()`)
`Histogram`	`histogram`	Distribution of values with configurable buckets

Key Metrics by Category

Buffer Pool

Key metrics for monitoring buffer pool efficiency:

angarabase_buffer_pool_hit_total — cache hits; high ratio (>95%) is healthy
angarabase_buffer_pool_miss_total — cache misses; spikes indicate memory pressure
angarabase_buffer_pool_backpressure_active — 1 if backpressure active (memory pressure)

# Buffer pool hit ratio:
rate(angarabase_buffer_pool_hit_total[5m]) /
  (rate(angarabase_buffer_pool_hit_total[5m]) + rate(angarabase_buffer_pool_miss_total[5m]))

Checkpoint

angarabase_checkpoint_duration_ms — checkpoint latency; target P99 < 200ms
angarabase_checkpoint_dirty_pages — dirty pages pending checkpoint flush

# Alert: checkpoint latency exceeding 200ms threshold
angarabase_checkpoint_duration_ms > 200

# Alert: checkpoint running on large dirty page set (potential I/O spike)
angarabase_checkpoint_dirty_pages > 10000

WAL

angarabase_wal_bytes_written_total — WAL write throughput

# WAL write throughput (bytes/sec):
rate(angarabase_wal_bytes_written_total[5m])

Connections

angarabase_connections_active — active connections; alert if near max_connections

# Alert: connections above 90% of max_connections
# (replace 100 with your actual max_connections value)
angarabase_connections_active / 100 > 0.9

# Rate of new connection attempts:
rate(angarabase_connections_accepted_total[1m])

Columnar Storage GC (0.6.6.11)

angarabase_columnar_manifest_gc_removed_total — ghost segment refs tombstoned by manifest GC; steady growth is normal, sharp spikes indicate manifest bloat.
angarabase_columnar_compactor_dv_purged_total — columnar segments fully covered by delete vectors (DV) and purged by the compactor.
angarabase_index_gc_dead_fraction — fraction of index entries currently marked dead (range 0–1). Values above 0.15 trigger a preemptive extra GC sweep.

# Rate of ghost segment refs being cleaned up (should be > 0 if compaction runs):
rate(angarabase_columnar_manifest_gc_removed_total[5m])

# Alert: index dead fraction rising above 20% (GC not keeping pace):
angarabase_index_gc_dead_fraction > 0.20

Full Metrics Table

Metric Name	Type	Labels	Description
`angarabase_agg_stream_typed_key_total`	`Counter`	`none`	Aggregation stream typed-key operations total.
`angarabase_aqp_feedback_applied_total`	`Counter`	`none`	AQP correction feedback applied to optimizer total.
`angarabase_aqp_feedback_clamped_total`	`Counter`	`none`	AQP correction feedback clamped by bounds total.
`angarabase_auto_analyze_triggered_total`	`Counter`	`none`	Auto-analyze triggers total.
`angarabase_backpressure_active_sources`	`Gauge`	`none`	Number of storage sources currently applying backpressure.
`angarabase_buffer_pool_backpressure_active`	`Gauge`	`none`	Buffer pool backpressure currently active (1=yes, 0=no).
`angarabase_buffer_pool_backpressure_events_total`	`Counter`	`none`	Buffer pool backpressure events total.
`angarabase_buffer_pool_decomp_spill_total`	`Counter`	`none`	Buffer pool decompression spills to disk total.
`angarabase_buffer_pool_evict_failed_total`	`Counter`	`none`	Buffer pool page eviction failures total.
`angarabase_buffer_pool_hit_ratio_milli`	`Gauge`	`none`	Buffer pool hit ratio × 1000 (milli-fraction).
`angarabase_buffer_pool_hit_total`	`Counter`	`none`	Buffer pool cache hits total.
`angarabase_buffer_pool_miss_total`	`Counter`	`none`	Buffer pool cache misses total.
`angarabase_buffer_pool_over_capacity_pages`	`Gauge`	`none`	Pages loaded above configured buffer pool capacity.
`angarabase_buffer_pool_uncommitted_dirty_pages`	`Gauge`	`none`	Buffer pool frames carrying uncommitted page-image deltas.
`angarabase_buffer_pool_waiter_wait_seconds`	`Histogram`	`none`	Time buffer pool waiters spend blocked waiting for a free frame.
`angarabase_buffer_pool_warmup_aborted_at_cap_total`	`Counter`	`none`	Buffer pool warmup attempts aborted due to capacity limit total.
`angarabase_buffer_pool_warmup_completed_pages`	`Gauge`	`none`	Pages loaded during last completed buffer pool warmup.
`angarabase_buffer_pool_warmup_evictions_during_warmup_total`	`Counter`	`none`	Evictions that occurred during buffer pool warmup total.
`angarabase_buffer_pool_warmup_pages_total`	`Counter`	`none`	Pages loaded by buffer pool warmup total.
`angarabase_buffer_ring_active_slots`	`Gauge`	`none`	Active buffer ring slots.
`angarabase_buffer_ring_created_total`	`Counter`	`none`	Buffer ring slots created total.
`angarabase_buffer_ring_dropped_total`	`Counter`	`none`	Buffer ring slots dropped total.
`angarabase_buffer_ring_evictions_total`	`Counter`	`none`	Buffer ring evictions total.
`angarabase_catalog_snapshot_segments_total`	`Gauge`	`none`	Catalog snapshot segments currently held.
`angarabase_chain_read_legacy_fallback_total`	`Counter`	`none`	Version-chain reads falling back to legacy path total.
`angarabase_chain_read_total`	`Counter`	`none`	Version-chain reads total.
`angarabase_checkpoint_aborted_total`	`Counter`	`none`	Checkpoints aborted total.
`angarabase_checkpoint_dirty_pages`	`Gauge`	`none`	Dirty pages pending checkpoint flush.
`angarabase_checkpoint_dirty_pages_leq_target`	`Gauge`	`none`	Dirty pages at or below checkpoint target (1=yes, 0=no).
`angarabase_checkpoint_errors_total`	`Counter`	`none`	Checkpoint errors total.
`angarabase_checkpoint_index_flush_errors_total`	`Counter`	`none`	Index flush errors during checkpoint total.
`angarabase_checkpoint_target_lsn_current`	`Gauge`	`none`	Current checkpoint target LSN.
`angarabase_checkpoint_scan_pages_total`	`Counter`	`none`	Total pages inspected during checkpoint (dirty bitmap: O(dirty pages); full scan: O(total pages)).
`angarabase_checkpoint_total`	`Counter`	`none`	Checkpoints completed total.
`angarabase_column_cache_evictions_total`	`Counter`	`none`	Columnar column cache evictions total.
`angarabase_column_cache_oom_rejected_total`	`Counter`	`none`	Column cache allocations rejected due to OOM total.
`angarabase_columnar_compaction_bytes_read_total`	`Counter`	`none`	Bytes read during columnar compaction total.
`angarabase_columnar_compaction_bytes_written_total`	`Counter`	`none`	Bytes written during columnar compaction total.
`angarabase_columnar_compaction_total`	`Counter`	`none`	Columnar compaction runs total.
`angarabase_columnar_delete_vectors_applied_rows_total`	`Counter`	`none`	Rows affected by columnar delete vectors total.
`angarabase_columnar_delete_vectors_attached_total`	`Counter`	`none`	Columnar delete vectors attached total.
`angarabase_columnar_direct_io_fallback_total`	`Counter`	`none`	Columnar reads falling back from direct I/O total.
`angarabase_columnar_dml_duration_ms`	`Histogram`	`none`	Columnar DML operation duration in milliseconds.
`angarabase_columnar_manifest_init_failed_total`	`Counter`	`none`	Columnar manifest initialisation failures total.
`angarabase_committed_version_exhausted_total`	`Counter`	`none`	Committed version slot exhaustion events total.
`angarabase_compress_duration_us_total`	`Counter`	`none`	Cumulative compression time in microseconds.
`angarabase_compress_ops_total`	`Counter`	`none`	Compression operations total.
`angarabase_compression_downgrade_total`	`Counter`	`none`	Compression algorithm downgrades (payload too small) total.
`angarabase_compression_ratio_ema_milli`	`Gauge`	`none`	EMA compression ratio × 1000.
`angarabase_config_unknown_keys_total`	`Counter`	`none`	Unknown configuration keys encountered at startup total.
`angarabase_deadlock_detected_total`	`Counter`	`none`	Deadlocks detected by the lock manager total.
`angarabase_decompress_duration_us_total`	`Counter`	`none`	Cumulative decompression time in microseconds.
`angarabase_decompress_ops_total`	`Counter`	`none`	Decompression operations total.
`angarabase_deployment_probe_cgroup_v1`	`Gauge`	`none`	Deployment probe detected cgroup v1 (1=yes, 0=no).
`angarabase_deployment_probe_cgroup_v2`	`Gauge`	`none`	Deployment probe detected cgroup v2 (1=yes, 0=no).
`angarabase_deployment_probe_fallback_total`	`Counter`	`none`	Deployment probe fallback events total.
`angarabase_deployment_probe_override_blocked_total`	`Counter`	`none`	Deployment probe override blocked events total.
`angarabase_deployment_probe_runs_total`	`Counter`	`none`	Deployment probe runs total.
`angarabase_deployment_profile_bare_metal_total`	`Counter`	`none`	Deployments on bare-metal profile total.
`angarabase_deployment_profile_container_total`	`Counter`	`none`	Deployments on container profile total.
`angarabase_engine_optimizer_catalog_row_count_fallback_total`	`Counter`	`none`	Optimizer catalog row-count fallback events total.
`angarabase_engine_optimizer_index_scan_chosen_total`	`Counter`	`none`	Optimizer chose index scan total.
`angarabase_engine_optimizer_small_table_seq_scan_total`	`Counter`	`none`	Optimizer chose sequential scan for small table total.
`angarabase_engine_optimizer_stale_stats_fallback_total`	`Counter`	`none`	Optimizer fell back due to stale statistics total.
`angarabase_expr_ir_arena_chunks_total`	`Counter`	`none`	Expression IR arena chunks allocated total.
`angarabase_expr_ir_arena_released_bytes_total`	`Counter`	`none`	Expression IR arena bytes released total.
`angarabase_expr_ir_arena_reserved_bytes_total`	`Counter`	`none`	Expression IR arena bytes reserved total.
`angarabase_expr_ir_fallback_total`	`Counter`	`none`	Expression IR evaluation fallbacks total.
`angarabase_fsync_timeout_total`	`Counter`	`none`	fsync timeout events total.
`angarabase_gc_background_ticks_total`	`Counter`	`none`	GC background tick cycles total.
`angarabase_gc_compact_calls_total`	`Counter`	`none`	GC compaction calls total.
`angarabase_gc_compact_history_versions_removed_total`	`Counter`	`none`	Old MVCC history versions removed by GC compaction total.
`angarabase_gc_compact_slice_duration_ms_bucket_1`	`Counter`	`none`	GC compact slice duration histogram bucket ≤1ms.
`angarabase_gc_compact_slice_duration_ms_bucket_10`	`Counter`	`none`	GC compact slice duration histogram bucket ≤10ms.
`angarabase_gc_compact_slice_duration_ms_bucket_100`	`Counter`	`none`	GC compact slice duration histogram bucket ≤100ms.
`angarabase_gc_compact_slice_duration_ms_bucket_5`	`Counter`	`none`	GC compact slice duration histogram bucket ≤5ms.
`angarabase_gc_compact_slice_duration_ms_bucket_50`	`Counter`	`none`	GC compact slice duration histogram bucket ≤50ms.
`angarabase_gc_compact_slice_duration_ms_bucket_500`	`Counter`	`none`	GC compact slice duration histogram bucket ≤500ms.
`angarabase_gc_compact_slice_duration_ms_bucket_inf`	`Counter`	`none`	GC compact slice duration histogram bucket +Inf.
`angarabase_gc_compact_slice_duration_ms_count`	`Counter`	`none`	GC compact slice duration histogram observation count.
`angarabase_gc_compact_slice_duration_ms_sum`	`Counter`	`none`	GC compact slice duration histogram sum (ms).
`angarabase_gc_compact_slices_total`	`Counter`	`none`	GC compaction slices processed total.
`angarabase_gc_compact_tables_removed_total`	`Counter`	`none`	Tables fully removed by GC compaction total.
`angarabase_gc_compact_tables_scanned_total`	`Counter`	`none`	Tables scanned by GC compaction total.
`angarabase_gc_compact_versions_removed_total`	`Counter`	`none`	MVCC versions removed by GC compaction total.
`angarabase_gc_tuning_bloat_ratio_percent`	`Gauge`	`none`	GC tuning: current bloat ratio estimate (percent).
`angarabase_gc_tuning_budget_tuples_per_cycle`	`Gauge`	`none`	GC tuning: adaptive budget tuples per cycle.
`angarabase_gc_tuning_cycle_duration_ms_last`	`Gauge`	`none`	Last GC tuning cycle duration in ms.
`angarabase_gc_tuning_decision_total_decrease`	`Counter`	`none`	GC tuning decisions to decrease budget total.
`angarabase_gc_tuning_decision_total_hold`	`Counter`	`none`	GC tuning decisions to hold budget total.
`angarabase_gc_tuning_decision_total_increase`	`Counter`	`none`	GC tuning decisions to increase budget total.
`angarabase_gc_tuning_min_active_epoch_lag`	`Gauge`	`none`	Minimum active epoch lag seen by GC tuner.
`angarabase_gc_tuning_sleep_ms`	`Gauge`	`none`	GC tuner current sleep interval in ms.
`angarabase_gc_watermark_snapshot`	`Gauge`	`none`	GC safe watermark snapshot epoch.
`angarabase_gc_pages_compacted_total`	`Counter`	`none`	Heap pages compacted by GcWorker (dead-tuple reclaim) total.
`angarabase_gc_dead_tuples_reclaimed_total`	`Counter`	`none`	Dead tuple slots reclaimed by GcWorker total.
`angarabase_group_commit_batches_total`	`Counter`	`none`	WAL group-commit batches flushed total.
`angarabase_hash_join_build_rows_total`	`Counter`	`none`	Hash join build-side rows processed total.
`angarabase_hash_join_probe_rows_total`	`Counter`	`none`	Hash join probe-side rows processed total.
`angarabase_hash_join_spilled_to_nested_loop_total`	`Counter`	`none`	Hash joins that spilled and fell back to nested loop total.
`angarabase_heap_deletes_total`	`Counter`	`none`	Heap row deletions total.
`angarabase_heap_dml_errors_total`	`Counter`	`none`	Heap DML errors total.
`angarabase_heap_inserts_total`	`Counter`	`none`	Heap row insertions total.
`angarabase_heap_pages_flushed_on_shutdown`	`Counter`	`none`	Heap pages flushed during graceful shutdown.
`angarabase_heap_point_fetch_fallback_reason_not_found_total`	`Counter`	`none`	Heap point-fetch fallbacks: row not found total.
`angarabase_heap_point_fetch_fallback_reason_stale_tid_index_total`	`Counter`	`none`	Heap point-fetch fallbacks: stale TID index total.
`angarabase_heap_point_fetch_fallback_total`	`Counter`	`none`	Heap point-fetch fallbacks total.
`angarabase_heap_point_fetch_total`	`Counter`	`none`	Heap point-fetch attempts total.
`angarabase_heap_tid_index_ready`	`Gauge`	`none`	Heap TID index readiness (1=ready, 0=not ready).
`angarabase_heap_updates_total`	`Counter`	`none`	Heap row updates total.
`angarabase_htap_staleness_ms`	`Gauge`	`none`	HTAP read-replica staleness in milliseconds.
`angarabase_idle_txn_killed_total`	`Counter`	`none`	Idle transactions killed by the idle-timeout janitor total.
`angarabase_index_build_aborts_total`	`Counter`	`none`	Index build aborts total.
`angarabase_index_builds_total`	`Counter`	`none`	Index builds started total.
`angarabase_index_deletes_total`	`Counter`	`none`	Index key deletions total.
`angarabase_index_drops_total`	`Counter`	`none`	Index drop operations total.
`angarabase_index_inserts_total`	`Counter`	`none`	Index key insertions total.
`angarabase_index_lookups_total`	`Counter`	`none`	Index lookup operations total.
`angarabase_index_migration_completed_total`	`Counter`	`none`	Index migrations completed total.
`angarabase_index_migration_failed_total`	`Counter`	`none`	Index migration failures total.
`angarabase_index_not_found_total`	`Counter`	`none`	Index lookup: key not found total.
`angarabase_index_only_scan_heap_fetches_total`	`Counter`	`none`	Heap fetches during index-only scans total.
`angarabase_index_only_scan_hits_total`	`Counter`	`none`	Index-only scan hits (no heap fetch required) total.
`angarabase_index_pages_total`	`Gauge`	`index_name`	Total pages in an index.
`angarabase_index_pkey_no_table_id_total`	`Gauge`	`none`	Primary-key index entries with no resolved table ID.
`angarabase_index_range_scans_total`	`Counter`	`none`	Index range scan operations total.
`angarabase_index_reject_total`	`Counter`	`none`	Index operation rejections total.
`angarabase_index_restore_empty_labeled_total`	`Counter`	`index, db`	Empty index restores (with index+db label) total.
`angarabase_index_restore_empty_total`	`Counter`	`none`	Empty index restores total.
`angarabase_index_restore_failed_total`	`Counter`	`index, db`	Index restore failures total.
`angarabase_index_routing_legacy_total`	`Counter`	`db`	Index routing via legacy path total.
`angarabase_index_scan_rows_fetched_total`	`Counter`	`none`	Rows fetched via index scan total.
`angarabase_index_stale_tuple_fallbacks_total`	`Counter`	`none`	Index scan stale-tuple fallbacks total.
`angarabase_io_advisor_current_batch_size`	`Gauge`	`none`	IO advisor current adaptive batch size.
`angarabase_io_backend_active`	`Gauge`	`backend`	IO backend active (1=active) per backend.
`angarabase_io_backend_active_component`	`Gauge`	`component, backend`	IO backend active per component and backend.
`angarabase_io_complete_total`	`Counter`	`op`	IO completions total per operation type.
`angarabase_io_error_total`	`Counter`	`op`	IO errors total per operation type.
`angarabase_io_submit_total`	`Counter`	`op`	IO submissions total per operation type.
`angarabase_io_uring_active_instances`	`Gauge`	`none`	Active io_uring ring instances.
`angarabase_io_uring_backpressure_total`	`Counter`	`none`	io_uring backpressure events total.
`angarabase_io_uring_cqe_completed_total`	`Counter`	`none`	io_uring CQEs completed total.
`angarabase_io_uring_direct_submit_total`	`Counter`	`none`	io_uring direct (non-SQPOLL) submissions total.
`angarabase_io_uring_fallback_total`	`Counter`	`none`	io_uring operations falling back to pread/pwrite total.
`angarabase_io_uring_inflight_high`	`Gauge`	`none`	io_uring high-watermark inflight operations.
`angarabase_io_uring_inflight_low`	`Gauge`	`none`	io_uring low-watermark inflight operations.
`angarabase_io_uring_parallel_inflight_high`	`Gauge`	`none`	io_uring parallel inflight high-watermark.
`angarabase_io_uring_parallel_inflight_low`	`Gauge`	`none`	io_uring parallel inflight low-watermark.
`angarabase_io_uring_read_fixed_total`	`Counter`	`none`	io_uring fixed-buffer reads total.
`angarabase_io_uring_registered_buffers_count`	`Gauge`	`none`	io_uring registered buffer count.
`angarabase_io_uring_sqe_submitted_total`	`Counter`	`none`	io_uring SQEs submitted total.
`angarabase_io_uring_sqpoll_enabled`	`Gauge`	`none`	io_uring SQPOLL mode enabled (1=yes, 0=no).
`angarabase_io_uring_task_panic_total`	`Counter`	`none`	io_uring task panics total.
`angarabase_io_uring_wal_write_error_total`	`Counter`	`none`	io_uring WAL write errors total.
`angarabase_io_uring_write_fixed_total`	`Counter`	`none`	io_uring fixed-buffer writes total.
`angarabase_ir_ddl_executed_total`	`Counter`	`none`	IR-path DDL statements executed total.
`angarabase_ir_dml_executed_total`	`Counter`	`none`	IR-path DML statements executed total.
`angarabase_ir_legacy_path_violation_total`	`Counter`	`none`	IR legacy path violations detected total.
`angarabase_ir_plan_depth_reject_total`	`Counter`	`none`	IR plans rejected for excessive depth total.
`angarabase_ir_plan_executed_total`	`Counter`	`none`	IR plans executed total.
`angarabase_l0_blob_bytes_written_total`	`Counter`	`none`	L0 blob bytes written total.
`angarabase_l0_blobs_active`	`Gauge`	`none`	Active L0 blobs.
`angarabase_legacy_fallback_triggered_total`	`Counter`	`none`	Legacy SQL execution fallbacks triggered total.
`angarabase_lock_acquire_total`	`Counter`	`none`	Lock acquisitions total.
`angarabase_lock_timeout_total`	`Counter`	`none`	Lock acquisition timeouts total.
`angarabase_manifest_log_appends_total`	`Counter`	`none`	Manifest log appends total.
`angarabase_manifest_log_checkpoints_total`	`Counter`	`none`	Manifest log checkpoints total.
`angarabase_manifest_log_replay_records_total`	`Counter`	`none`	Manifest log records replayed total.
`angarabase_merge_join_executions_total`	`Counter`	`none`	Merge join executions total.
`angarabase_mvcc_history_versions_total`	`Gauge`	`none`	Total MVCC history versions held.
`angarabase_notify_delivered_total`	`Counter`	`none`	LISTEN/NOTIFY notifications delivered total.
`angarabase_notify_dropped_total`	`Counter`	`none`	LISTEN/NOTIFY notifications dropped total.
`angarabase_notify_listeners_active`	`Gauge`	`none`	Active LISTEN subscribers.
`angarabase_optimizer_decorrelation_fallback_non_equi_predicate_total`	`Counter`	`none`	Optimizer decorrelation fallback: non-equi predicate total.
`angarabase_optimizer_decorrelation_fallback_null_semantics_risk_total`	`Counter`	`none`	Optimizer decorrelation fallback: null semantics risk total.
`angarabase_optimizer_decorrelation_fallback_total`	`Counter`	`none`	Optimizer decorrelation fallbacks total.
`angarabase_optimizer_decorrelation_fallback_unsafe_pattern_total`	`Counter`	`none`	Optimizer decorrelation fallback: unsafe pattern total.
`angarabase_optimizer_dp_fallback_total`	`Counter`	`none`	Optimizer dynamic-programming join-order fallbacks total.
`angarabase_optimizer_memo_entries`	`Gauge`	`none`	Optimizer memo table entries (last query).
`angarabase_optimizer_multicolumn_pairs_capped_total`	`Counter`	`none`	Optimizer multicolumn pair evaluation capped total.
`angarabase_optimizer_queries_total`	`Counter`	`none`	Queries processed by the optimizer total.
`angarabase_optimizer_replan_total_aqp_feedback`	`Counter`	`none`	Optimizer replans triggered by AQP feedback total.
`angarabase_optimizer_replan_total_forced_fallback`	`Counter`	`none`	Optimizer forced-fallback replans total.
`angarabase_optimizer_replan_total_schema_changed`	`Counter`	`none`	Optimizer replans due to schema change total.
`angarabase_optimizer_replan_total_stats_drift`	`Counter`	`none`	Optimizer replans due to stats drift total.
`angarabase_optimizer_stale_stats_total`	`Counter`	`none`	Optimizer stale statistics encounters total.
`angarabase_optimizer_timeout_total`	`Counter`	`none`	Optimizer timeout events total.
`angarabase_orphan_blobs_reclaimed_total`	`Counter`	`none`	Orphan blobs reclaimed by GC total.
`angarabase_overlay_rows_evicted_total`	`Counter`	`none`	TX overlay rows evicted total.
`angarabase_parallel_agg_total`	`Counter`	`none`	Parallel aggregation executions total.
`angarabase_parallel_budget_exceeded_total`	`Counter`	`none`	Parallel worker budget exceeded events total.
`angarabase_parallel_join_admitted_total`	`Counter`	`none`	Parallel join operations admitted total.
`angarabase_parallel_join_slots_active`	`Gauge`	`none`	Active parallel join slots.
`angarabase_parallel_join_throttled_total`	`Counter`	`none`	Parallel join operations throttled total.
`angarabase_parallel_morsels_stolen_total`	`Counter`	`none`	Parallel morsels stolen by work-stealing total.
`angarabase_parallel_morsels_total`	`Counter`	`none`	Parallel morsels created total.
`angarabase_parallel_scan_total`	`Counter`	`none`	Parallel scan operations total.
`angarabase_parallel_worker_cancel_total`	`Counter`	`none`	Parallel worker cancellations total.
`angarabase_parallel_worker_starvation_events_total`	`Counter`	`none`	Parallel worker starvation events total.
`angarabase_parallel_workers_active`	`Gauge`	`none`	Currently active parallel workers.
`angarabase_parallel_workers_denied_by_cap_total`	`Counter`	`none`	Parallel worker requests denied by DOP cap total.
`angarabase_partition_pruned_branches_total`	`Counter`	`none`	Partition branches pruned by predicate pushdown total.
`angarabase_partition_route_default_total`	`Counter`	`none`	Partition routes to default partition total.
`angarabase_partition_route_no_match_total`	`Counter`	`none`	Partition routes with no matching partition total.
`angarabase_partition_route_ok_total`	`Counter`	`none`	Successful partition routes total.
`angarabase_pgwire_active_tasks`	`Gauge`	`none`	Active pgwire tasks (queries in flight).
`angarabase_pgwire_pool_active_workers`	`Gauge`	`none`	Active pgwire workers (async spawn_blocking tasks or legacy pool busy workers).
`angarabase_pgwire_pool_queue_depth`	`Gauge`	`none`	pgwire pool pending connection queue depth.
`angarabase_pgwire_pool_rejected_total`	`Counter`	`none`	pgwire connections rejected by pool limit total.
`angarabase_pgwire_simple_queries_total`	`Counter`	`none`	pgwire simple-query protocol messages total.
`angarabase_pkey_backfill_fail_total`	`Counter`	`none`	Primary-key backfill failures total.
`angarabase_pkey_backfill_in_progress`	`Gauge`	`none`	Primary-key backfill operations in progress.
`angarabase_pkey_backfill_ok_total`	`Counter`	`none`	Primary-key backfill completions total.
`angarabase_plan_cache_dml_hit_duration_us`	`Histogram`	`none`	DML plan cache hit latency in microseconds.
`angarabase_plan_cache_dml_hits_total`	`Counter`	`none`	DML plan cache hits total.
`angarabase_plan_cache_dml_misses_total`	`Counter`	`none`	DML plan cache misses total.
`angarabase_plan_cache_dml_param_extract_error_total`	`Counter`	`none`	DML plan cache parameter extraction errors total.
`angarabase_plan_cache_dml_schema_miss_total`	`Counter`	`none`	DML plan cache schema mismatch misses total.
`angarabase_plan_cache_evictions_total`	`Counter`	`none`	Plan cache evictions total.
`angarabase_plan_cache_hits_total`	`Counter`	`none`	Plan cache hits total.
`angarabase_plan_cache_invalidations_total`	`Counter`	`none`	Plan cache invalidations total.
`angarabase_plan_cache_misses_total`	`Counter`	`none`	Plan cache misses total.
`angarabase_plan_cache_size`	`Gauge`	`none`	Current plan cache entry count.
`angarabase_prefetch_hints_total`	`Counter`	`none`	Prefetch hints issued total.
`angarabase_projection_pruning_cols_eliminated_total`	`Counter`	`none`	Columns eliminated by projection pruning total.
`angarabase_qos_blocking_inflight`	`Gauge`	`none`	QoS blocking inflight operations.
`angarabase_qos_priority_inherit_total`	`Counter`	`from, to`	QoS priority inheritance events total.
`angarabase_qos_queued_background_total`	`Counter`	`none`	QoS background-priority requests queued total.
`angarabase_qos_queued_critical_total`	`Counter`	`none`	QoS critical-priority requests queued total.
`angarabase_qos_queued_interactive_total`	`Counter`	`none`	QoS interactive-priority requests queued total.
`angarabase_qos_rejected_background_total`	`Counter`	`none`	QoS background-priority requests rejected total.
`angarabase_qos_rejected_critical_total`	`Counter`	`none`	QoS critical-priority requests rejected total.
`angarabase_qos_rejected_interactive_total`	`Counter`	`none`	QoS interactive-priority requests rejected total.
`angarabase_query_exec_duration_ms`	`Histogram`	`none`	Query execution duration in milliseconds.
`angarabase_query_exec_total`	`Counter`	`outcome, class`	Query executions total by outcome and class.
`angarabase_query_feedback_events_total`	`Counter`	`reason`	Query feedback events emitted total.
`angarabase_query_store_entries_total`	`Gauge`	`none`	Query store current entry count.
`angarabase_query_store_evictions_total`	`Counter`	`none`	Query store evictions total.
`angarabase_query_store_intervals_flushed_total`	`Counter`	`none`	Query store intervals flushed to WAL total.
`angarabase_query_store_mode`	`Gauge`	`none`	Query store current mode (encoded integer).
`angarabase_query_store_plans_total`	`Gauge`	`none`	Query store current plan count.
`angarabase_query_store_regressions_detected_total`	`Counter`	`none`	Query regressions detected by the query store total.
`angarabase_query_store_rotations_total`	`Counter`	`none`	Query store interval rotations total.
`angarabase_query_store_wal_errors_total`	`Counter`	`none`	Query store WAL write errors total.
`angarabase_recovery_analysis_ms`	`Gauge`	`none`	Recovery analysis phase duration in ms.
`angarabase_recovery_clr_records`	`Counter`	`none`	Recovery CLR (compensation log) records replayed total.
`angarabase_recovery_dirty_pages`	`Gauge`	`none`	Dirty pages remaining after recovery redo.
`angarabase_recovery_redo_records`	`Counter`	`none`	Recovery redo records applied total.
`angarabase_recovery_replay_pages_applied_total`	`Counter`	`none`	Recovery page replay: pages applied total.
`angarabase_recovery_replay_pages_runs_total`	`Counter`	`none`	Recovery page replay runs total.
`angarabase_recovery_replay_pages_skipped_total`	`Counter`	`none`	Recovery page replay: pages skipped total.
`angarabase_recovery_undo_txns`	`Counter`	`none`	Transactions rolled back during recovery total.
`angarabase_scan_stream_batches_total`	`Counter`	`none`	Scan stream batches produced total.
`angarabase_scan_stream_fallback_total`	`Counter`	`none`	Scan stream fallbacks to row-by-row total.
`angarabase_scan_stream_materialize_total`	`Counter`	`reason`	Scan stream materialise operations total by reason.
`angarabase_sequence_currval_total`	`Counter`	`none`	CURRVAL calls total.
`angarabase_sequence_nextval_total`	`Counter`	`none`	NEXTVAL calls total.
`angarabase_sequence_overflow_total`	`Counter`	`none`	Sequence overflow events total.
`angarabase_sequence_owned_create_failed_total`	`Counter`	`none`	Owned sequence create failures total.
`angarabase_sequence_owned_lazy_migration_total`	`Counter`	`none`	Owned sequence lazy migrations total.
`angarabase_sequence_owned_nextval_total`	`Counter`	`none`	Owned sequence NEXTVAL calls total.
`angarabase_sequence_setval_total`	`Counter`	`none`	SETVAL calls total.
`angarabase_server_connections_accepted_total`	`Counter`	`none`	Server connections accepted total.
`angarabase_server_connections_active`	`Gauge`	`none`	Currently active server connections.
`angarabase_session_claims_set_total`	`Counter`	`none`	Session JWT claim SET operations total.
`angarabase_shutdown_dirty_pages_remaining`	`Gauge`	`none`	Dirty pages remaining at shutdown start.
`angarabase_slow_query_total`	`Counter`	`none`	Slow queries exceeding log_min_duration_ms total.
`angarabase_spawn_blocking_active`	`Gauge`	`none`	Active spawn_blocking tasks.
`angarabase_spawn_blocking_max`	`Gauge`	`none`	Maximum observed spawn_blocking concurrency.
`angarabase_spill_bytes_in_use`	`Gauge`	`none`	Spill storage bytes currently in use.
`angarabase_spill_bytes_total`	`Counter`	`none`	Total bytes spilled to disk.
`angarabase_spill_direct_io_supported`	`Gauge`	`none`	Spill direct I/O supported on this filesystem (1=yes).
`angarabase_spill_files_total`	`Counter`	`none`	Spill files created total.
`angarabase_spill_hash_join_bloom_filtered_probe_rows_total`	`Counter`	`none`	Hash join bloom-filtered probe rows total.
`angarabase_spill_hash_join_recursion_depth_overflow_total`	`Counter`	`none`	Hash join recursion depth overflow events total.
`angarabase_spill_hash_join_recursive_partitions_total`	`Counter`	`none`	Recursive spill partitions created total.
`angarabase_spill_hash_join_skew_fallback_total`	`Counter`	`none`	Hash join skew fallbacks total.
`angarabase_spill_otmpfile_with_direct_supported`	`Gauge`	`none`	O_TMPFILE with direct I/O supported (1=yes).
`angarabase_spill_soft_quota_reached_total`	`Counter`	`none`	Spill soft quota reached events total.
`angarabase_sql_correlated_budget_reject_total`	`Counter`	`none`	Correlated subquery budget rejections total.
`angarabase_sql_cross_join_budget_reject_total`	`Counter`	`none`	Cross join budget rejections total.
`angarabase_sql_default_nextval_reject_total`	`Counter`	`none`	DEFAULT NEXTVAL rejections total.
`angarabase_sql_full_join_fallback_total`	`Counter`	`none`	FULL JOIN fallbacks total.
`angarabase_sql_identity_override_reject_total`	`Counter`	`none`	IDENTITY ALWAYS override rejections total.
`angarabase_sql_join_rows_produced_cross_total`	`Counter`	`none`	Rows produced by cross joins total.
`angarabase_sql_join_rows_produced_full_total`	`Counter`	`none`	Rows produced by full outer joins total.
`angarabase_sql_join_rows_produced_inner_total`	`Counter`	`none`	Rows produced by inner joins total.
`angarabase_sql_join_rows_produced_lateral_total`	`Counter`	`none`	Rows produced by lateral joins total.
`angarabase_sql_join_rows_produced_left_total`	`Counter`	`none`	Rows produced by left outer joins total.
`angarabase_sql_join_rows_produced_right_total`	`Counter`	`none`	Rows produced by right outer joins total.
`angarabase_sql_routing_total`	`Counter`	`decision`	SQL routing decisions total by decision type.
`angarabase_sql_scalar_subquery_cardinality_violations_total`	`Counter`	`none`	Scalar subquery cardinality violations total.
`angarabase_sql_sequence_allocations_identity_always_total`	`Counter`	`none`	Sequence allocations for IDENTITY ALWAYS columns total.
`angarabase_sql_sequence_allocations_identity_by_default_total`	`Counter`	`none`	Sequence allocations for IDENTITY BY DEFAULT columns total.
`angarabase_sql_sequence_allocations_serial_total`	`Counter`	`none`	Sequence allocations for SERIAL columns total.
`angarabase_sql_upsert_conflict_total`	`Counter`	`none`	UPSERT conflict events total.
`angarabase_sql_upsert_do_nothing_total`	`Counter`	`none`	UPSERT ON CONFLICT DO NOTHING events total.
`angarabase_sql_upsert_do_update_total`	`Counter`	`none`	UPSERT ON CONFLICT DO UPDATE events total.
`angarabase_stat_statements_entries_current`	`Gauge`	`none`	Current stat_statements entry count.
`angarabase_stat_statements_evicted_total`	`Counter`	`none`	stat_statements LRU evictions total (high rate → literal normalization gap).
`angarabase_storage_backpressure_commit_rejected_total`	`Counter`	`none`	Commits rejected by storage backpressure total.
`angarabase_storage_backpressure_events_total`	`Counter`	`none`	Storage backpressure events total.
`angarabase_storage_cached_pages_total`	`Gauge`	`none`	Pages currently cached in the storage layer.
`angarabase_storage_dirty_pages_total`	`Gauge`	`none`	Total dirty pages in the storage layer.
`angarabase_storage_flush_append_total`	`Counter`	`none`	Storage flush append operations total.
`angarabase_storage_flush_bytes_total`	`Counter`	`none`	Storage flush bytes written total.
`angarabase_storage_flush_duration_seconds`	`Histogram`	`none`	Storage flush operation duration in seconds.
`angarabase_storage_flush_eviction_duration_ms_last`	`Gauge`	`none`	Last storage flush eviction duration in ms.
`angarabase_storage_flush_full_total`	`Counter`	`none`	Storage full flushes total.
`angarabase_storage_flush_ok_total`	`Counter`	`none`	Successful storage flush operations total.
`angarabase_storage_flush_skipped_page_lsn_ahead_total`	`Counter`	`none`	Storage flush skips: page LSN ahead of flush LSN total.
`angarabase_storage_flush_skipped_pinned_total`	`Counter`	`none`	Storage flush skips: page pinned total.
`angarabase_storage_flush_skipped_uncommitted_total`	`Counter`	`none`	Storage flush skips: uncommitted page total.
`angarabase_storage_io_read_duration_ms`	`Histogram`	`none`	Storage I/O read duration in milliseconds.
`angarabase_storage_io_write_duration_ms`	`Histogram`	`none`	Storage I/O write duration in milliseconds.
`angarabase_storage_per_table_engine_fallback_total`	`Counter`	`none`	Per-table engine fallback events total.
`angarabase_storage_per_table_engines_count`	`Gauge`	`none`	Number of per-table storage engine overrides.
`angarabase_storage_scan_errors_total`	`Gauge`	`none`	Storage scan errors total.
`angarabase_storage_sync_data_total`	`Counter`	`none`	Storage data sync operations total.
`angarabase_stream_entries_total`	`Counter`	`none`	Stream (CDC) entries published total.
`angarabase_stream_subscriptions_active`	`Gauge`	`none`	Active stream subscriptions.
`angarabase_syscatalog_db_lazy_load_duration_ms_last`	`Gauge`	`none`	Last system-catalog lazy-load duration in ms.
`angarabase_syscatalog_db_unavailable_total`	`Counter`	`none`	System-catalog DB unavailable events total.
`angarabase_syscatalog_global_baseline_load_duration_ms_last`	`Gauge`	`none`	Last system-catalog global baseline load duration in ms.
`angarabase_table_lock_contention_total`	`Counter`	`none`	Table-level lock contention events total.
`angarabase_transaction_log_bytes_appended_total`	`Counter`	`none`	WAL bytes appended total.
`angarabase_transaction_log_checkpoint_chain_broken_total`	`Counter`	`none`	WAL checkpoint chain breaks total.
`angarabase_transaction_log_checkpoint_end_invalid_total`	`Counter`	`none`	Invalid WAL checkpoint-end records total.
`angarabase_transaction_log_checkpoint_end_valid_total`	`Counter`	`none`	Valid WAL checkpoint-end records total.
`angarabase_transaction_log_durable_lsn`	`Gauge`	`none`	WAL durable (fsync-confirmed) LSN.
`angarabase_transaction_log_flush_lsn`	`Gauge`	`none`	WAL flush (write-confirmed) LSN.
`angarabase_transaction_log_group_commit_pending_lsn`	`Gauge`	`none`	WAL group-commit pending LSN.
`angarabase_transaction_log_group_commit_pumps_total`	`Counter`	`none`	WAL group-commit pump iterations total.
`angarabase_transaction_log_lag_commit_minus_durable_lsn`	`Gauge`	`none`	WAL lag: commit LSN minus durable LSN.
`angarabase_transaction_log_lag_flush_minus_durable_lsn`	`Gauge`	`none`	WAL lag: flush LSN minus durable LSN.
`angarabase_transaction_log_lag_pending_minus_durable_lsn`	`Gauge`	`none`	WAL lag: pending LSN minus durable LSN.
`angarabase_transaction_log_last_checkpoint_id`	`Gauge`	`none`	WAL last checkpoint identifier.
`angarabase_transaction_log_last_checkpoint_target_lsn`	`Gauge`	`none`	WAL last checkpoint target LSN.
`angarabase_transaction_log_last_commit_lsn`	`Gauge`	`none`	WAL last commit LSN.
`angarabase_transaction_log_records_appended_total`	`Counter`	`none`	WAL records appended total.
`angarabase_transaction_log_scan_stop_reason_total_bad_crc`	`Counter`	`none`	WAL scan stopped: bad CRC total.
`angarabase_transaction_log_scan_stop_reason_total_bad_len`	`Counter`	`none`	WAL scan stopped: bad record length total.
`angarabase_transaction_log_scan_stop_reason_total_bad_magic`	`Counter`	`none`	WAL scan stopped: bad magic bytes total.
`angarabase_transaction_log_scan_stop_reason_total_bad_version`	`Counter`	`none`	WAL scan stopped: bad version total.
`angarabase_transaction_log_scan_stop_reason_total_partial_record`	`Counter`	`none`	WAL scan stopped: partial record total.
`angarabase_tx_overlay_dataset_bytes_total`	`Gauge`	`none`	TX overlay dataset bytes in use.
`angarabase_tx_overlay_dataset_limit_exceeded_total`	`Counter`	`none`	TX overlay dataset limit exceeded events total.
`angarabase_txn_active_count`	`Gauge`	`none`	Currently active transactions.
`angarabase_txn_begin_total`	`Counter`	`none`	Transactions begun total.
`angarabase_txn_commit_conflicts_total`	`Counter`	`none`	Transaction commit conflicts (serialization failures) total.
`angarabase_txn_commit_epoch_current`	`Gauge`	`none`	Current transaction commit epoch.
`angarabase_txn_commit_epoch_exhausted_total`	`Counter`	`none`	Transaction commit epoch exhaustion events total.
`angarabase_txn_commit_total`	`Counter`	`none`	Transactions committed total.
`angarabase_txn_id_exhausted_total`	`Counter`	`none`	Transaction ID exhaustion events total.
`angarabase_txn_long_snapshot_hard_total`	`Counter`	`none`	Long-running snapshot hard-limit violations total.
`angarabase_txn_long_snapshot_warn_total`	`Counter`	`none`	Long-running snapshot warnings total.
`angarabase_txn_oldest_snapshot_age_seconds`	`Gauge`	`none`	Age of the oldest active snapshot in seconds.
`angarabase_txn_release_savepoint_total`	`Counter`	`none`	RELEASE SAVEPOINT calls total.
`angarabase_txn_rollback_to_savepoint_total`	`Counter`	`none`	ROLLBACK TO SAVEPOINT calls total.
`angarabase_txn_rollback_total`	`Counter`	`none`	Transactions rolled back total.
`angarabase_txn_savepoint_total`	`Counter`	`none`	SAVEPOINT calls total.
`angarabase_txn_watermark_min_active`	`Gauge`	`none`	Minimum active transaction watermark.
`angarabase_txn_watermark_safe_gc`	`Gauge`	`none`	Safe GC watermark (all txns below this epoch are committed/aborted).
`angarabase_txn_watermark_safe_gc_lag_snapshots`	`Gauge`	`none`	Number of snapshots lagging behind the safe GC watermark.
`angarabase_txn_write_set_limit_exceeded_total`	`Counter`	`none`	Transactions rejected for exceeding write-set size limit total.
`angarabase_txn_write_set_pages_max`	`Gauge`	`none`	Maximum write-set pages per transaction configuration.
`angarabase_undo_append_rejected_total`	`Counter`	`none`	Undo log append rejections total.
`angarabase_undo_file_bytes`	`Gauge`	`none`	Undo file size in bytes.
`angarabase_undo_gc_truncations_total`	`Counter`	`none`	Undo GC truncations total.
`angarabase_undo_segments_total`	`Gauge`	`none`	Total undo segments.
`angarabase_undo_store_bytes`	`Gauge`	`none`	Undo store bytes in use.
`angarabase_uptime_seconds`	`Gauge`	`none`	Server uptime in seconds.
`angarabase_vector_batches_produced_total`	`Counter`	`none`	Vectorised execution batches produced total.
`angarabase_vector_columnar_native_total`	`Counter`	`none`	Vector aggregate executions via native columnar batch pipeline.
`angarabase_columnar_batched_scan_batches_total`	`Counter`	`none`	Columnar segment batches consumed by vector-native batched scans.
`angarabase_columnar_segments_pruned_total`	`Counter`	`none`	Columnar segments pruned by zone-map predicate pushdown before blob I/O.
`angarabase_columnar_filtered_agg_late_mat_total`	`Counter`	`none`	Filtered columnar aggregate scans using predicate-first late materialization.
`angarabase_vector_fallback_total`	`Counter`	`none`	Vectorised execution fallbacks to row mode total.
`angarabase_vector_memory_budget_exceeded_total`	`Counter`	`none`	Vector execution memory budget exceeded events total.
`angarabase_vector_rows_produced_total`	`Counter`	`none`	Rows produced by vectorised execution total.
`angarabase_version_arena_capacity_exceeded_total`	`Counter`	`none`	Version arena capacity exceeded events total.
`angarabase_version_chain_gc_removed_heads_total`	`Counter`	`none`	Version chain GC: removed head entries total.
`angarabase_version_chain_rebuild_from_wal_total`	`Counter`	`none`	Version chains rebuilt from WAL during recovery total.
`angarabase_version_head_map_size`	`Gauge`	`none`	Version head map current entry count.
`angarabase_wal_decompressed_records_total`	`Counter`	`none`	WAL records decompressed total.
`angarabase_wal_decompression_errors_total`	`Counter`	`none`	WAL decompression errors total.
`angarabase_wal_group_commit_wait_total`	`Counter`	`none`	WAL group-commit waiter events total.
`angarabase_wal_lsn_drift_resets_total`	`Counter`	`none`	WAL LSN drift reset events total.
`angarabase_wal_record_iterator_lsn_order_violations_total`	`Counter`	`none`	WAL record iterator LSN-order violations total.
`angarabase_wal_record_iterator_vlf_transitions_total`	`Counter`	`none`	WAL record iterator VLF segment transitions total.
`angarabase_wal_sync_wait_total`	`Counter`	`none`	WAL sync waits total.
`angarabase_write_hook_duration_ms_total`	`Counter`	`none`	Write hook cumulative duration in ms.
`angarabase_write_hook_invocations_total`	`Counter`	`none`	Write hook invocations total.
`angarabase_write_path_commits_ok_total`	`Counter`	`none`	Write path successful commits total.
`angarabase_write_path_concurrent_waiters`	`Gauge`	`none`	Current write path concurrent waiters.
`angarabase_write_path_lock_free_commits_total`	`Counter`	`none`	Lock-free write path commits total.
`angarabase_write_path_phase_a_total`	`Counter`	`none`	Write path phase-A (prepare) completions total.
`angarabase_write_path_phase_b_timeout_total`	`Counter`	`none`	Write path phase-B timeouts total.
`angarabase_write_path_phase_b_total`	`Counter`	`none`	Write path phase-B (commit) completions total.
`angarabase_write_path_serialized_commits_total`	`Counter`	`none`	Serialized (non-lock-free) write path commits total.
`angarabase_write_write_conflicts_total`	`Counter`	`none`	Write-write conflicts detected total.

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