groups:
- name: substrate.rules
  rules:

  ##############################################################################
  # Block production
  ##############################################################################

  - alert: BlockProductionSlow
    annotations:
      message: 'Best block on instance {{ $labels.instance }} increases by
      less than 1 per minute for more than 3 minutes.'
    expr: increase(substrate_block_height{status="best"}[1m]) < 1
    for: 3m
    labels:
      severity: warning
  - alert: BlockProductionSlow
    annotations:
      message: 'Best block on instance {{ $labels.instance }} increases by
      less than 1 per minute for more than 10 minutes.'
    expr: increase(substrate_block_height{status="best"}[1m]) < 1
    for: 10m
    labels:
      severity: critical

  ##############################################################################
  # Block finalization
  ##############################################################################

  - alert: BlockFinalizationSlow
    expr: increase(substrate_block_height{status="finalized"}[1m]) < 1
    for: 3m
    labels:
      severity: warning
    annotations:
      message: 'Finalized block on instance {{ $labels.instance }} increases by
      less than 1 per minute for more than 3 minutes.'
  - alert: BlockFinalizationSlow
    expr: increase(substrate_block_height{status="finalized"}[1m]) < 1
    for: 10m
    labels:
      severity: critical
    annotations:
      message: 'Finalized block on instance {{ $labels.instance }} increases by
      less than 1 per minute for more than 10 minutes.'
  - alert: BlockFinalizationLaggingBehind
    # Under the assumption of an average block production of 6 seconds,
    # "best" and "finalized" being more than 10 blocks apart would imply
    # more than a 1 minute delay between block production and finalization.
    expr: '(substrate_block_height{status="best"} - ignoring(status)
    substrate_block_height{status="finalized"}) > 10'
    for: 8m
    labels:
      severity: critical
    annotations:
      message: "Block finalization on instance {{ $labels.instance }} is behind
      block production by {{ $value }} for more than 8 minutes."

  ##############################################################################
  # Transaction queue
  ##############################################################################

  - alert: TransactionQueueSizeIncreasing
    expr: 'increase(substrate_sub_txpool_validations_scheduled[5m]) -
    increase(substrate_sub_txpool_validations_finished[5m]) > 0'
    for: 10m
    labels:
      severity: warning
    annotations:
      message: 'The transaction pool size on node {{ $labels.instance }} has
      been monotonically increasing for more than 10 minutes.'
  - alert: TransactionQueueSizeIncreasing
    expr: 'increase(substrate_sub_txpool_validations_scheduled[5m]) -
    increase(substrate_sub_txpool_validations_finished[5m]) > 0'
    for: 30m
    labels:
      severity: warning
    annotations:
      message: 'The transaction pool size on node {{ $labels.instance }} has
      been monotonically increasing for more than 30 minutes.'
  - alert: TransactionQueueSizeHigh
    expr: 'substrate_sub_txpool_validations_scheduled -
    substrate_sub_txpool_validations_finished > 10000'
    for: 5m
    labels:
      severity: warning
    annotations:
      message: 'The transaction pool size on node {{ $labels.instance }} has
      been above 10_000 for more than 5 minutes.'

  ##############################################################################
  # Networking
  ##############################################################################

  - alert: NumberOfPeersLow
    expr: substrate_sub_libp2p_peers_count < 3
    for: 3m
    labels:
      severity: warning
    annotations:
      message: 'The node {{ $labels.instance }} has less than 3 peers for more
      than 3 minutes'
  - alert: NumberOfPeersLow
    expr: substrate_sub_libp2p_peers_count < 3
    for: 15m
    labels:
      severity: critical
    annotations:
      message: 'The node {{ $labels.instance }} has less than 3 peers for more
      than 15 minutes'
  - alert: NoIncomingConnection
    expr: increase(substrate_sub_libp2p_incoming_connections_total[20m]) == 0
    labels:
      severity: warning
    annotations:
      message: 'The node {{ $labels.instance }} has not received any new incoming
      TCP connection in the past 20 minutes. Is it connected to the Internet?'

  ##############################################################################
  # System
  ##############################################################################

  - alert: NumberOfFileDescriptorsHigh
    expr: 'node_filefd_allocated{chain!=""} > 10000'
    for: 3m
    labels:
      severity: warning
    annotations:
      message: 'The node {{ $labels.instance }} has more than 10_000 file
      descriptors allocated for more than 3 minutes'

  ##############################################################################
  # Others
  ##############################################################################

  - alert: AuthorityDiscoveryDiscoveryFailureHigh
    expr: 'substrate_authority_discovery_handle_value_found_event_failure /
    ignoring(name)
    substrate_authority_discovery_dht_event_received{name="value_found"} > 0.5'
    for: 2h
    labels:
      severity: warning
    annotations:
      message: 'Authority discovery on node {{ $labels.instance }} fails to
      process more than 50 % of the values found on the DHT for more than 2
      hours.'

  - alert: UnboundedChannelPersistentlyLarge
    expr: 'substrate_unbounded_channel_size >= 200'
    for: 5m
    labels:
      severity: warning
    annotations:
      message: 'Channel {{ $labels.entity }} on node {{ $labels.instance }} contains
      more than 200 items for more than 5 minutes. Node might be frozen.'

  - alert: UnboundedChannelVeryLarge
    expr: '(
        (substrate_unbounded_channel_len{action = "send"} -
            ignoring(action) substrate_unbounded_channel_len{action = "received"})
        or on(instance) substrate_unbounded_channel_len{action = "send"}
    ) > 15000'
    labels:
      severity: warning
    annotations:
      message: 'Channel {{ $labels.entity }} on node {{ $labels.instance }} contains more than
      15000 items.'