refactor(ipld): migrate metrics scheme

docs/fendermint/observability.md

@@ -49,6 +49,29 @@ This is achieved through the use of the `ipc-observability` crate/library, which
 - `ipc_topdown_parent_finality_voting_quorum_height` (IntGauge): Sets the height of the parent finality quorum.
 - `ipc_topdown_parent_finality_voting_quorum_weight` (IntGauge): Sets the weight of the parent finality quorum.
 - `ipc_topdown_parent_finality_committed_height` (IntGauge): Sets the height of the committed parent finality.
+- `ipld_resolver_ping_rtt` (Histogram): Records a ping roundtrip time.
+- `ipld_resolver_ping_timeouts` (IntCounter): Incremented when a ping timed out.
+- `ipld_resolver_ping_failure` (IntCounter): Incremented when a ping failed.
+- `ipld_resolver_ping_success` (IntCounter): Incremented when a ping succeeded.
+- `ipld_resolver_identify_failure` (IntCounter): Incremented when an identify failed.
+- `ipld_resolver_identify_received` (IntCounter): Incremented when an identify info received.
+- `ipld_resolver_discovery_background_lookup` (IntCounter): Incremented when a discovery background lookup started.
+- `ipld_resolver_discovery_connected_peers` (IntGauge): Sets the number of discovery connected peers.
+- `ipld_resolver_membership_skipped_peers` (IntCounter): Incremented when a membership provider skipped.
+- `ipld_resolver_membership_routable_peers` (IntGauge): Sets the number of routable peers.
+- `ipld_resolver_membership_provider_peers` (IntGauge): Sets the number of unique peers.
+- `ipld_resolver_membership_unknown_topic` (IntCounter): Incremented when a membership of unknown topic received.
+- `ipld_resolver_membership_invalid_message` (IntCounter): Incremented when a membership with invalid message received.
+- `ipld_resolver_membership_publish_total` (IntCounter): Incremented when a membership published.
+- `ipld_resolver_membership_publish_failure` (IntCounter): Incremented when a membership publish failed.
+- `ipld_resolver_content_resolve_running` (IntGauge): Sets the number currently running content resolutions.
+- `ipld_resolver_content_resolve_no_peers` (IntCounter): Incremented when a resolution had no peer.
+- `ipld_resolver_content_resolve_success` (IntCounter): Incremented when a resolution succeeded.
+- `ipld_resolver_content_resolve_failure` (IntCounter): Incremented when a resolution failed.
+- `ipld_resolver_content_resolve_fallback` (IntCounter): Incremented when a resolution had a fallback.
+- `ipld_resolver_content_resolve_peers` (Histogram): Records the number of peers found for a resolution from a subnet.
+- `ipld_resolver_content_connected_peers` (Histogram): Records the number connected peers in a resolution.
+- `ipld_resolver_content_rate_limited` (IntCounter): Incremented when a resolution was rate limited.
 - `ipc_tracing_errors` (IntCounterVec): Increments the count of tracing errors for the affected event.
 
 ## Events and corresponding metrics
@@ -290,6 +313,76 @@ Represents the commitment of parent finality.
 
 - `ipc_topdown_parent_finality_committed_height`
 
+### PingEvent
+
+**Variants and affected metrics:**
+
+- `Success(PeerId, Duration)`: `ipld_resolver_ping_rtt`,`ipld_resolver_ping_success`
+
+### PingFailureEvent
+
+**Variants and affected metrics:**
+
+- `Timeout(PeerId)`: `ipld_resolver_ping_timeouts`
+- `Failure(PeerId, Duration)`: `ipld_resolver_ping_failure`
+
+### IdentifyEvent
+
+**Variants and affected metrics:**
+
+- `Received(PeerId)`: `ipld_resolver_identify_received`
+
+### IdentifyFailureEvent
+
+**Variants and affected metrics:**
+
+- `Failure(PeerId, String)`: `ipld_resolver_identify_failure`
+
+### DiscoveryEvent
+
+**Variants and affected metrics:**
+
+- `BackgroundLookup(PeerId)`: `ipld_resolver_discovery_background_lookup`
+- `ConnectionEstablished(PeerId)`: `ipld_resolver_discovery_connected_peers`
+- `ConnectionClosed(PeerId)`: `ipld_resolver_discovery_connected_peers`
+
+### MembershipEvent
+
+**Variants and affected metrics:**
+
+- `Added(PeerId)`: `ipld_resolver_membership_provider_peers`
+- `Removed(PeerId)`: `ipld_resolver_membership_provider_peers`
+- `Skipped(PeerId)`: `ipld_resolver_membership_skipped_peers`
+- `PublishSuccess`: `ipld_resolver_membership_publish_total`
+- `RoutablePeers(i64)`: `ipld_resolver_membership_routable_peers`
+
+### MembershipFailureEvent
+
+**Variants and affected metrics:**
+
+- `PublishFailure(String)`: `ipld_resolver_membership_publish_failure`
+- `GossipInvalidProviderRecord(Option<PeerId>, String)`: `ipld_resolver_membership_invalid_message`
+- `GossipInvalidVoteRecord(Option<PeerId>, String)`: `ipld_resolver_membership_invalid_message`
+- `GossipUnknownTopic(Option<PeerId>, TopicHash)`: `ipld_resolver_membership_unknown_topic`
+
+### ResolveEvent
+
+**Variants and affected metrics:**
+
+- `Started(Cid)`: `ipld_resolver_content_resolve_running`
+- `Success(Cid)`: `ipld_resolver_content_resolve_success`
+- `Completed`: `ipld_resolver_content_resolve_running`
+- `Peers(usize)`: `ipld_resolver_content_resolve_peers`
+- `NoPeers`: `ipld_resolver_content_resolve_no_peers`
+- `ConnectedPeers(usize)`: `ipld_resolver_content_connected_peers`
+
+### ResolveFailureEvent
+
+**Variants and affected metrics:**
+
+- `Failure(Cid)`: `ipld_resolver_content_resolve_failure`
+- `Fallback(Cid)`: `ipld_resolver_content_resolve_fallback`
+
 ### TracingError
 
 **Description:**

ipld/resolver/Cargo.toml

@@ -34,6 +34,7 @@ fvm_shared = { workspace = true }
 fvm_ipld_blockstore = { workspace = true, optional = true }
 
 ipc-api = { path = "../../ipc/api", default-features = false }
+ipc-observability = { workspace = true }
 
 [dev-dependencies]
 cid = { workspace = true }

ipld/resolver/src/behaviour/content.rs

@@ -7,6 +7,11 @@ use std::{
     time::Duration,
 };
 
+use crate::{
+    limiter::{RateLimit, RateLimiter},
+    observe,
+};
+use ipc_observability::emit;
 use libipld::{store::StoreParams, Cid};
 use libp2p::{
     core::{ConnectedPoint, Endpoint},
@@ -22,11 +27,6 @@ use libp2p_bitswap::{Bitswap, BitswapConfig, BitswapEvent, BitswapResponse, Bits
 use log::debug;
 use prometheus::Registry;
 
-use crate::{
-    limiter::{RateLimit, RateLimiter},
-    stats,
-};
-
 pub type QueryId = libp2p_bitswap::QueryId;
 
 // Not much to do here, just hiding the `Progress` event as I don't think we'll need it.
@@ -140,7 +140,7 @@ impl<P: StoreParams> Behaviour<P> {
     /// will initiate connections to the peers which aren't connected at the moment.
     pub fn resolve(&mut self, cid: Cid, peers: Vec<PeerId>) -> QueryId {
         debug!("resolving {cid} from {peers:?}");
-        stats::CONTENT_RESOLVE_RUNNING.inc();
+        emit(observe::ResolveEvent::Started(cid));
         // Not passing any missing items, which will result in a call to `BitswapStore::missing_blocks`.
         self.inner.sync(cid, peers, [].into_iter())
     }
@@ -334,7 +334,7 @@ impl<P: StoreParams> NetworkBehaviour for Behaviour<P> {
                 ToSwarm::GenerateEvent(ev) => match ev {
                     BitswapEvent::Progress(_, _) => {}
                     BitswapEvent::Complete(id, result) => {
-                        stats::CONTENT_RESOLVE_RUNNING.dec();
+                        emit(observe::ResolveEvent::Completed);
                         let out = Event::Complete(id, result);
                         return Poll::Ready(ToSwarm::GenerateEvent(out));
                     }

ipld/resolver/src/behaviour/discovery.rs

@@ -8,6 +8,9 @@ use std::{
     time::Duration,
 };
 
+use super::NetworkConfig;
+use crate::observe;
+use ipc_observability::emit;
 use libp2p::{
     core::Endpoint,
     identify::Info,
@@ -23,11 +26,6 @@ use libp2p::{
 };
 use log::{debug, warn};
 use tokio::time::Interval;
-
-use crate::stats;
-
-use super::NetworkConfig;
-
 // NOTE: The Discovery behaviour is largely based on what exists in Forest. If it ain't broken...
 // NOTE: Not sure if emitting events is going to be useful yet, but for now it's an example of having one.
 
@@ -178,7 +176,7 @@ impl Behaviour {
     pub fn background_lookup(&mut self, peer_id: PeerId) {
         if self.addresses_of_peer(peer_id).is_empty() {
             if let Some(kademlia) = self.inner.as_mut() {
-                stats::DISCOVERY_BACKGROUND_LOOKUP.inc();
+                emit(observe::DiscoveryEvent::BackgroundLookup(peer_id));
                 kademlia.get_closest_peers(peer_id);
             }
         }
@@ -241,13 +239,13 @@ impl NetworkBehaviour for Behaviour {
         match &event {
             FromSwarm::ConnectionEstablished(e) => {
                 if e.other_established == 0 {
-                    stats::DISCOVERY_CONNECTED_PEERS.inc();
+                    emit(observe::DiscoveryEvent::ConnectionEstablished(e.peer_id));
                     self.num_connections += 1;
                 }
             }
             FromSwarm::ConnectionClosed(e) => {
                 if e.remaining_established == 0 {
-                    stats::DISCOVERY_CONNECTED_PEERS.dec();
+                    emit(observe::DiscoveryEvent::ConnectionClosed(e.peer_id));
                     self.num_connections -= 1;
                 }
             }

ipld/resolver/src/behaviour/membership.rs

@@ -5,8 +5,16 @@ use std::marker::PhantomData;
 use std::task::{Context, Poll};
 use std::time::Duration;
 
+use super::NetworkConfig;
+use crate::hash::blake2b_256;
+use crate::observe;
+use crate::provider_cache::{ProviderDelta, SubnetProviderCache};
+use crate::provider_record::{ProviderRecord, SignedProviderRecord};
+use crate::vote_record::{SignedVoteRecord, VoteRecord};
+use crate::Timestamp;
 use anyhow::anyhow;
 use ipc_api::subnet_id::SubnetID;
+use ipc_observability::emit;
 use libp2p::core::Endpoint;
 use libp2p::gossipsub::{
     self, IdentTopic, MessageAuthenticity, MessageId, PublishError, Sha256Topic, SubscriptionError,
@@ -24,14 +32,6 @@ use serde::de::DeserializeOwned;
 use serde::Serialize;
 use tokio::time::{Instant, Interval};
 
-use crate::hash::blake2b_256;
-use crate::provider_cache::{ProviderDelta, SubnetProviderCache};
-use crate::provider_record::{ProviderRecord, SignedProviderRecord};
-use crate::vote_record::{SignedVoteRecord, VoteRecord};
-use crate::{stats, Timestamp};
-
-use super::NetworkConfig;
-
 /// `Gossipsub` topic identifier for subnet membership.
 const PUBSUB_MEMBERSHIP: &str = "/ipc/membership";
 /// `Gossipsub` topic identifier for voting about content.
@@ -326,11 +326,13 @@ where
         );
         match self.inner.publish(self.membership_topic.clone(), data) {
             Err(e) => {
-                stats::MEMBERSHIP_PUBLISH_FAILURE.inc();
+                emit(observe::MembershipFailureEvent::PublishFailure(
+                    e.to_string(),
+                ));
                 Err(anyhow!(e))
             }
             Ok(_msg_id) => {
-                stats::MEMBERSHIP_PUBLISH_SUCCESS.inc();
+                emit(observe::MembershipEvent::PublishSuccess);
                 self.last_publish_timestamp = Timestamp::now();
                 self.next_publish_timestamp =
                     self.last_publish_timestamp + self.publish_interval.period();
@@ -346,11 +348,13 @@ where
         let data = vote.into_envelope().into_protobuf_encoding();
         match self.inner.publish(topic, data) {
             Err(e) => {
-                stats::MEMBERSHIP_PUBLISH_FAILURE.inc();
+                emit(observe::MembershipFailureEvent::PublishFailure(
+                    e.to_string(),
+                ));
                 Err(anyhow!(e))
             }
             Ok(_msg_id) => {
-                stats::MEMBERSHIP_PUBLISH_SUCCESS.inc();
+                emit(observe::MembershipEvent::PublishSuccess);
                 Ok(())
             }
         }
@@ -363,11 +367,13 @@ where
         let topic = self.preemptive_topic(&subnet_id);
         match self.inner.publish(topic, data) {
             Err(e) => {
-                stats::MEMBERSHIP_PUBLISH_FAILURE.inc();
+                emit(observe::MembershipFailureEvent::PublishFailure(
+                    e.to_string(),
+                ));
                 Err(anyhow!(e))
             }
             Ok(_msg_id) => {
-                stats::MEMBERSHIP_PUBLISH_SUCCESS.inc();
+                emit(observe::MembershipEvent::PublishSuccess);
                 Ok(())
             }
         }
@@ -378,8 +384,9 @@ where
     /// Call this method when the discovery service learns the address of a peer.
     pub fn set_routable(&mut self, peer_id: PeerId) {
         self.provider_cache.set_routable(peer_id);
-        stats::MEMBERSHIP_ROUTABLE_PEERS
-            .set(self.provider_cache.num_routable().try_into().unwrap());
+
+        let num_routable = self.provider_cache.num_routable().try_into().unwrap();
+        emit(observe::MembershipEvent::RoutablePeers(num_routable));
         self.publish_for_new_peer(peer_id);
     }
 
@@ -406,33 +413,27 @@ where
         if msg.topic == self.membership_topic.hash() {
             match SignedProviderRecord::from_bytes(&msg.data).map(|r| r.into_record()) {
                 Ok(record) => self.handle_provider_record(record),
-                Err(e) => {
-                    stats::MEMBERSHIP_INVALID_MESSAGE.inc();
-                    warn!(
-                        "Gossip message from peer {:?} could not be deserialized as ProviderRecord: {e}",
-                        msg.source
-                    );
-                }
+                Err(e) => emit(
+                    observe::MembershipFailureEvent::GossipInvalidProviderRecord(
+                        msg.source,
+                        e.to_string(),
+                    ),
+                ),
             }
         } else if self.voting_topics.contains(&msg.topic) {
             match SignedVoteRecord::from_bytes(&msg.data).map(|r| r.into_record()) {
                 Ok(record) => self.handle_vote_record(record),
-                Err(e) => {
-                    stats::MEMBERSHIP_INVALID_MESSAGE.inc();
-                    warn!(
-                        "Gossip message from peer {:?} could not be deserialized as VoteRecord: {e}",
-                        msg.source
-                    );
-                }
+                Err(e) => emit(observe::MembershipFailureEvent::GossipInvalidVoteRecord(
+                    msg.source,
+                    e.to_string(),
+                )),
             }
         } else if let Some(subnet_id) = self.preemptive_topics.get(&msg.topic) {
             self.handle_preemptive_data(subnet_id.clone(), msg.data)
         } else {
-            stats::MEMBERSHIP_UNKNOWN_TOPIC.inc();
-            warn!(
-                "unknown gossipsub topic in message from {:?}: {}",
-                msg.source, msg.topic
-            );
+            emit(observe::MembershipFailureEvent::GossipUnknownTopic(
+                msg.source, msg.topic,
+            ));
         }
     }
 
@@ -444,7 +445,7 @@ where
         debug!("received provider record: {record:?}");
         let (event, publish) = match self.provider_cache.add_provider(&record) {
             None => {
-                stats::MEMBERSHIP_SKIPPED_PEERS.inc();
+                emit(observe::MembershipEvent::Skipped(record.peer_id));
                 (Some(Event::Skipped(record.peer_id)), false)
             }
             Some(d) if d.is_empty() && !d.is_new => (None, false),
@@ -459,7 +460,7 @@ where
         }
 
         if publish {
-            stats::MEMBERSHIP_PROVIDER_PEERS.inc();
+            emit(observe::MembershipEvent::Added(record.peer_id));
             self.publish_for_new_peer(record.peer_id)
         }
     }
@@ -514,7 +515,7 @@ where
         let cutoff_timestamp = Timestamp::now() - self.max_provider_age;
         let pruned = self.provider_cache.prune_providers(cutoff_timestamp);
         for peer_id in pruned {
-            stats::MEMBERSHIP_PROVIDER_PEERS.dec();
+            emit(observe::MembershipEvent::Removed(peer_id));
             self.outbox.push_back(Event::Removed(peer_id))
         }
     }

ipld/resolver/src/lib.rs

@@ -4,8 +4,8 @@ mod behaviour;
 mod client;
 mod hash;
 mod limiter;
+mod observe;
 mod service;
-mod stats;
 mod timestamp;
 
 mod provider_cache;