Add prometheus metrics for pending Allocates and Claims

prog/weaver/metrics.go

@@ -82,6 +82,18 @@ var metrics = []metric{
 				ch <- intGauge(desc, metrics.Flows)
 			}
 		}},
+	{desc("weave_ipam_pending_allocates", "Number of pending allocates."),
+		func(s WeaveStatus, desc *prometheus.Desc, ch chan<- prometheus.Metric) {
+			if s.IPAM != nil {
+				ch <- intGauge(desc, len(s.IPAM.PendingAllocates))
+			}
+		}},
+	{desc("weave_ipam_pending_claims", "Number of pending claims."),
+		func(s WeaveStatus, desc *prometheus.Desc, ch chan<- prometheus.Metric) {
+			if s.IPAM != nil {
+				ch <- intGauge(desc, len(s.IPAM.PendingClaims))
+			}
+		}},
 }
 
 func fastDPMetrics(s WeaveStatus) *weave.FastDPMetrics {

site/metrics.md

@@ -19,6 +19,8 @@ exposed:
 * `weave_max_ips` - Size of IP address space used by allocator.
 * `weave_dns_entries` - Number of DNS entries.
 * `weave_flows` - Number of FastDP flows.
+* `weave_ipam_pending_allocates` - Number of pending allocates.
+* `weave_ipam_pending_claims` - Number of pending claims.
 
 #### Publish Router Metrics Endpoint