Add validator monitor metrics

[dapplion]

Reviewed this file and select interesting metrics to add
https://github.com/sigp/lighthouse/blob/stable/beacon_node/beacon_chain/src/metrics.rs

Validator monitoring (own validators)

High priority to add these. All metrics are indexed by validator (probably index)

Validator Monitor Metrics (per-epoch summaries)

• validator_monitor_prev_epoch_on_chain_attester_hit: Incremented if the validator is flagged as a previous epoch attester during per epoch processing
• validator_monitor_prev_epoch_on_chain_attester_miss: Incremented if the validator is not flagged as a previous epoch attester during per epoch processing
• validator_monitor_prev_epoch_on_chain_head_attester_hit: Incremented if the validator is flagged as a previous epoch head attester during per epoch processing
• validator_monitor_prev_epoch_on_chain_head_attester_miss: Incremented if the validator is not flagged as a previous epoch head attester during per epoch processing
• validator_monitor_prev_epoch_on_chain_target_attester_hit: Incremented if the validator is flagged as a previous epoch target attester during per epoch processing
• validator_monitor_prev_epoch_on_chain_target_attester_miss: Incremented if the validator is not flagged as a previous epoch target attester during per epoch processing
• validator_monitor_prev_epoch_on_chain_inclusion_distance: The attestation inclusion distance calculated during per epoch processing
• validator_monitor_prev_epoch_attestations_total: The number of unagg. attestations seen in the previous epoch.
• validator_monitor_prev_epoch_attestations_min_delay_seconds: The min delay between when the validator should send the attestation and when it was received.
• validator_monitor_prev_epoch_attestation_aggregate_inclusions: The count of times an attestation was seen inside an aggregate.
• validator_monitor_prev_epoch_attestation_block_inclusions: The count of times an attestation was seen inside a block.
• validator_monitor_prev_epoch_attestation_block_min_inclusion_distance: The minimum inclusion distance observed for the inclusion of an attestation in a block.
• validator_monitor_prev_epoch_beacon_blocks_total: The number of beacon_blocks seen in the previous epoch.
• validator_monitor_prev_epoch_beacon_blocks_min_delay_seconds: The min delay between when the validator should send the block and when it was received.
• validator_monitor_prev_epoch_aggregates_total: The number of aggregates seen in the previous epoch.
• validator_monitor_prev_epoch_aggregates_min_delay_seconds: The min delay between when the validator should send the aggregate and when it was received.

Validator Monitor Metrics (real-time)

• validator_monitor_validators_total: Count of validators that are specifically monitored by this beacon node
• validator_monitor_unaggregated_attestation_total: Number of unaggregated attestations seen
• validator_monitor_unaggregated_attestation_delay_seconds: The delay between when the validator should send the attestation and when it was received.
• validator_monitor_aggregated_attestation_total: Number of aggregated attestations seen
• validator_monitor_aggregated_attestation_delay_seconds: The delay between then the validator should send the aggregate and when it was received.
• validator_monitor_attestation_in_aggregate_total: Number of times an attestation has been seen in an aggregate
• validator_monitor_attestation_in_aggregate_delay_seconds: The delay between when the validator should send the aggregate and when it was received.
• validator_monitor_attestation_in_block_total: Number of times an attestation has been seen in a block
• validator_monitor_attestation_in_block_delay_slots: The excess slots (beyond the minimum delay) between the attestation slot and the block slot.
• validator_monitor_beacon_block_total: Number of beacon blocks seen
• validator_monitor_beacon_block_delay_seconds: The delay between when the validator should send the block and when it was received.

Validator Monitor Metrics (balances, etc)

• validator_monitor_balance_gwei: The validator's balance in gwei.
• validator_monitor_effective_balance_gwei: The validator's effective balance in gwei.
• validator_monitor_slashed: Set to 1 if the validator is slashed.
• validator_monitor_active: Set to 1 if the validator is active.

[g11tech]

@dapplion assign please if you wish to delegate.

[dapplion]

@g11in Most (or all) of the metrics are already implemented, review existing before diving in 👍

[dapplion]

Implemented