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diff --git a/src/provisioningserver/prometheus/metrics.py b/src/provisioningserver/prometheus/metrics.py
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index 8f117ff..bc2e6bb 100644
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--- a/src/provisioningserver/prometheus/metrics.py
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+++ b/src/provisioningserver/prometheus/metrics.py
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@@ -108,6 +108,15 @@ METRICS_DEFINITIONS = [
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        "maas_lxd_fetch_machine_failure",
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        "maas_lxd_fetch_machine_failure",
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        "failures for fetching LXD machines",
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        "failures for fetching LXD machines",
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    ),
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    ),
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    MetricDefinition(
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        "Counter",
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        "maas_rpc_pool_exhaustion_count",
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        """
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        counts the number of occurances of the RPC
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        connection pool allocate its maxmimum number
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        of connections
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        """,
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    ),
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    # Common metrics
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    # Common metrics
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    *node_metrics_definitions(),
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    *node_metrics_definitions(),
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]
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]
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diff --git a/src/provisioningserver/rpc/connectionpool.py b/src/provisioningserver/rpc/connectionpool.py
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index 3acaf08..55b00cb 100644
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--- a/src/provisioningserver/rpc/connectionpool.py
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+++ b/src/provisioningserver/rpc/connectionpool.py
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@@ -8,6 +8,7 @@ import random
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from twisted.internet.defer import inlineCallbacks
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from twisted.internet.defer import inlineCallbacks
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from twisted.internet.endpoints import connectProtocol, TCP6ClientEndpoint
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from twisted.internet.endpoints import connectProtocol, TCP6ClientEndpoint
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from provisioningserver.prometheus.metrics import PROMETHEUS_METRICS
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from provisioningserver.rpc import exceptions
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from provisioningserver.rpc import exceptions
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@@ -80,6 +81,7 @@ class ConnectionPool:
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    def stage_connection(self, eventloop, connection):
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    def stage_connection(self, eventloop, connection):
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        self.try_connections[eventloop] = connection
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        self.try_connections[eventloop] = connection
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    @PROMETHEUS_METRICS.failure_counter("maas_rpc_pool_exhaustion_count")
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    @inlineCallbacks
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    @inlineCallbacks
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    def scale_up_connections(self):
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    def scale_up_connections(self):
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        for ev, ev_conns in self.connections.items():
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        for ev, ev_conns in self.connections.items():
Status:	Merged
Approved by:	Christian Grabowski on 2022-09-19
Approved revision:	ecff69b7c7dc52bb947ef85f40dc7e6f4c2f66d4
Merge reported by:	MAAS Lander
Merged at revision:	not available
Proposed branch:	~cgrabowski/maas:add_rpc_conn_pool_metric
Merge into:	maas:master
Diff against target:	40 lines (+11/-0) 2 files modified src/provisioningserver/prometheus/metrics.py (+9/-0) src/provisioningserver/rpc/connectionpool.py (+2/-0)
Related bugs:	Link a bug report
Reviewer	Date Requested	Status
MAAS Lander		Approve on 2022-09-19
Anton Troyanov		Approve on 2022-09-16
Alexsander de Souza	2022-09-15	Approve on 2022-09-15
Review via email: mp+429985@code.launchpad.net