fix: Dedup pattern tokens on output (#13534)

pkg/pattern/drain/drain.go

@@ -158,6 +158,7 @@ func New(config *Config, format string, metrics *Metrics) *Drain {
 	default:
 		tokenizer = newPunctuationTokenizer()
 	}
+
 	d.idToCluster = createLogClusterCache(config.MaxClusters, func(int, *LogCluster) {
 		if metrics != nil {
 			if d.pruning {
@@ -170,7 +171,10 @@ func New(config *Config, format string, metrics *Metrics) *Drain {
 			limiter.Evict()
 		}
 	})
-	d.tokenizer = tokenizer
+	d.tokenizer = &DedupingTokenizer{
+		LineTokenizer: tokenizer,
+		dedupParam:    config.ParamString,
+	}
 	d.limiter = limiter
 	return d
 }
@@ -297,14 +301,6 @@ func deduplicatePlaceholders(line string, placeholder string) string {
 	return unsafeString(builder)
 }
 
-func (d *Drain) PatternString(c *LogCluster) string {
-	s := deduplicatePlaceholders(d.tokenizer.Join(c.Tokens, c.TokenState), d.config.ParamString)
-	if s == d.config.ParamString {
-		return ""
-	}
-	return s
-}
-
 func (d *Drain) Prune() {
 	d.pruneTree(d.rootNode)
 }

pkg/pattern/drain/drain_test.go

@@ -260,7 +260,7 @@ func TestDrain_TrainExtractsPatterns(t *testing.T) {
 				`I0507 <_>       1 defaultevictor.go:202] "Pod fails the following checks" pod="<_>" checks="[pod is a mirror pod, pod is a static pod, pod has system critical priority, pod has higher priority than specified priority class threshold, pod has local storage and descheduler is not configured with evictLocalStoragePods]"`,
 				`I0507 <_>       1 defaultevictor.go:202] "Pod fails the following checks" pod="<_>" checks="pod has local storage and descheduler is not configured with evictLocalStoragePods"`,
 				`I0507 <_>       1 defaultevictor.go:202] "Pod fails the following checks" pod="<_>" checks="pod is a DaemonSet pod"`,
-				`I0507 <_>       1 node.go:157] "Pod does not fit on any other node" pod:="<_>" node:="<_>" error:="[pod node selector does not match the node label, <_> <_><_> <_> <_><_> <_> <_>]"`,
+				`I0507 <_>       1 node.go:157] "Pod does not fit on any other node" pod:="<_>" node:="<_>" error:="[pod node selector does not match the node label, <_> <_> <_> <_> <_> <_>]"`,
 				`I0507 <_>       1 node.go:157] "Pod does not fit on any other node" pod:="<_>" node:="<_>" error:="[pod node selector does not match the node label, insufficient <_>, insufficient <_>]"`,
 				`I0507 <_>       1 node.go:157] "Pod does not fit on any other node" pod:="<_>" node:="<_>" error:="[pod node selector does not match the node label, insufficient <_>]"`,
 				`I0507 <_>       1 node.go:157] "Pod does not fit on any other node" pod:="<_>" node:="<_>" error:="[pod node selector does not match the node label, pod does not tolerate taints on the node, insufficient <_>, insufficient <_>]"`,

pkg/pattern/drain/line_tokenizer.go

@@ -286,3 +286,12 @@ func isVariableField(key []byte) bool {
 		bytes.EqualFold(key, []byte("time")) ||
 		bytes.EqualFold(key, []byte("timestamp"))
 }
+
+type DedupingTokenizer struct {
+	LineTokenizer
+	dedupParam string
+}
+
+func (d DedupingTokenizer) Join(tokens []string, state interface{}) string {
+	return deduplicatePlaceholders(d.LineTokenizer.Join(tokens, state), d.dedupParam)
+}