diff --git a/source/Canopy-Metrics-Tests/CanopyZincCounterTest.class.st b/source/Canopy-Metrics-Tests/CanopyZincCounterTest.class.st
index 9754eec..6ab2b84 100644
--- a/source/Canopy-Metrics-Tests/CanopyZincCounterTest.class.st
+++ b/source/Canopy-Metrics-Tests/CanopyZincCounterTest.class.st
@@ -5,6 +5,34 @@ Class {
 	#package : 'Canopy-Metrics-Tests'
 }
 
+{ #category : 'as yet unclassified' }
+CanopyZincCounterTest >> testAnExcludedPrefixIsNotCounted [
+	"The scrape endpoint is the obvious one to leave out: a counter of HTTP requests that counts
+	the requests reading it measures partly itself."
+	| counter |
+	counter := CanopyZincCounter new.
+	counter addExcludePrefix: '/metrics'.
+	counter handleAnnouncement: (CanopyZincTestAnnouncement new url: '/metrics'; responseCode: 200 duration: 5; yourself).
+	self assert: counter requests equals: 0.
+	counter handleAnnouncement: (CanopyZincTestAnnouncement new url: '/api/grids'; responseCode: 200 duration: 5; yourself).
+	self assert: counter requests equals: 1
+]
+
+{ #category : 'as yet unclassified' }
+CanopyZincCounterTest >> testOnlyRequestsUnderAnIncludedPrefixAreCounted [
+	"What the deployed servers do: narrow the count to '/api'. Without it Canopy counted every
+	request the image ever answered, which is not the number the dashboards have been showing."
+	| counter |
+	counter := CanopyZincCounter new.
+	counter addIncludePrefix: '/api'.
+	counter handleAnnouncement: (CanopyZincTestAnnouncement new url: '/status'; responseCode: 200 duration: 5; yourself).
+	self assert: counter requests equals: 0.
+	self assert: (counter responses at: 200) equals: 0.
+	counter handleAnnouncement: (CanopyZincTestAnnouncement new url: '/api/grids'; responseCode: 200 duration: 5; yourself).
+	self assert: counter requests equals: 1.
+	self assert: (counter responses at: 200) equals: 1
+]
+
 { #category : 'as yet unclassified' }
 CanopyZincCounterTest >> testAFreshCounterAlreadyCarriesTheUsualStatusCodes [
 	"Parity with what the servers export today: the status series exist from the first scrape at
diff --git a/source/Canopy-Metrics-Tests/CanopyZincTestAnnouncement.class.st b/source/Canopy-Metrics-Tests/CanopyZincTestAnnouncement.class.st
index 4605389..4e9194f 100644
--- a/source/Canopy-Metrics-Tests/CanopyZincTestAnnouncement.class.st
+++ b/source/Canopy-Metrics-Tests/CanopyZincTestAnnouncement.class.st
@@ -3,7 +3,8 @@ Class {
 	#superclass : 'Object',
 	#instVars : [
 		'responseCode',
-		'duration'
+		'duration',
+		'url'
 	],
 	#category : 'Canopy-Metrics-Tests',
 	#package : 'Canopy-Metrics-Tests'
@@ -19,6 +20,18 @@ CanopyZincTestAnnouncement >> responseCode [
 	^ responseCode
 ]
 
+{ #category : 'accessing' }
+CanopyZincTestAnnouncement >> url [
+	"Defaults to a path the deployed servers count, so a test that does not care about filtering
+	does not have to say anything about it."
+	^ url ifNil: [ '/api/grids' asZnUrl ]
+]
+
+{ #category : 'accessing' }
+CanopyZincTestAnnouncement >> url: aString [
+	url := aString asZnUrl
+]
+
 { #category : 'accessing' }
 CanopyZincTestAnnouncement >> responseCode: aCode duration: aDuration [
 	responseCode := aCode.
diff --git a/source/Canopy-Metrics/CanopyZincCounter.class.st b/source/Canopy-Metrics/CanopyZincCounter.class.st
index c4ff648..92b906b 100644
--- a/source/Canopy-Metrics/CanopyZincCounter.class.st
+++ b/source/Canopy-Metrics/CanopyZincCounter.class.st
@@ -5,7 +5,9 @@ Class {
 		'requests',
 		'responses',
 		'duration',
-		'registration'
+		'registration',
+		'includePrefixes',
+		'excludePrefixes'
 	],
 	#classInstVars : [
 		'instance'
@@ -40,6 +42,20 @@ CanopyZincCounter class >> uninstall [
 	^ self instance uninstall
 ]
 
+{ #category : 'configuring' }
+CanopyZincCounter >> addExcludePrefix: aString [
+	"Do not count requests to this path. The scrape endpoint itself is the obvious candidate -
+	left alone, a counter of HTTP requests counts the requests that read it."
+	excludePrefixes add: aString
+]
+
+{ #category : 'configuring' }
+CanopyZincCounter >> addIncludePrefix: aString [
+	"Count only requests to this path. As soon as one is named, everything else is ignored -
+	the deployed servers narrow the count to '/api' this way."
+	includePrefixes add: aString
+]
+
 { #category : 'counting' }
 CanopyZincCounter >> adjustDuration: aDuration [
 	duration ifNil: [ ^ duration := aDuration ].
@@ -60,8 +76,20 @@ CanopyZincCounter >> durationCanopy [
 		value: self duration
 ]
 
+{ #category : 'counting' }
+CanopyZincCounter >> countsRequestTo: aUrl [
+	"Named prefixes narrow what is counted, excluded ones drop out of whatever is left. Both
+	lists are honoured; with neither, everything counts."
+	| pfad |
+	pfad := aUrl pathPrintString.
+	(excludePrefixes anySatisfy: [ :each | pfad beginsWith: each ]) ifTrue: [ ^ false ].
+	includePrefixes ifEmpty: [ ^ true ].
+	^ includePrefixes anySatisfy: [ :each | pfad beginsWith: each ]
+]
+
 { #category : 'counting' }
 CanopyZincCounter >> handleAnnouncement: anAnnouncement [
+	(self countsRequestTo: anAnnouncement url) ifFalse: [ ^ self ].
 	self increaseRequests.
 	self increaseStatusCode: anAnnouncement responseCode.
 	self adjustDuration: anAnnouncement duration
@@ -85,6 +113,8 @@ CanopyZincCounter >> initialize [
 	requests := 0.
 	duration := 0.
 	responses := Dictionary new.
+	includePrefixes := OrderedCollection new.
+	excludePrefixes := OrderedCollection new.
 	self initializeResponses
 ]