libpcp: further refinements to dup instance label logging

Related to Red Hat bug RHEL-67227

Author: natoscott

qa/1368.out

@@ -34,24 +34,6 @@ Metric Labels in the Log ...
         [0] name(2,3) : value(7,3) [instances]
     InDom 29.2[900] labels (11 bytes): {"bin":900}
         [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[100] labels (11 bytes): {"bin":100}
-        [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[200] labels (11 bytes): {"bin":200}
-        [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[300] labels (11 bytes): {"bin":300}
-        [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[400] labels (11 bytes): {"bin":400}
-        [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[500] labels (11 bytes): {"bin":500}
-        [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[600] labels (11 bytes): {"bin":600}
-        [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[700] labels (11 bytes): {"bin":700}
-        [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[800] labels (11 bytes): {"bin":800}
-        [0] name(2,3) : value(7,3) [instances]
-    InDom 29.2[900] labels (11 bytes): {"bin":900}
-        [0] name(2,3) : value(7,3) [instances]
 
 === Dump help text
 

qa/1502.out

@@ -840,38 +840,6 @@ Fri Mar 15 09:53:02.050538091 2024
     InDom 29.12[3] labels (0 bytes): 
     InDom 29.12[4] labels (0 bytes): 
 Fri Mar 15 09:53:10.084432000 2024
-    InDom 29.3[0] labels (19 bytes): {"transient":false}
-        [0] name(2,9) : value(13,5) [instances]
-    InDom 29.3[21] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[24] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[26] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[27] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[29] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[30] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[35] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[36] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[37] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[38] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[39] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[40] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[41] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[42] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
-    InDom 29.3[43] labels (18 bytes): {"transient":true}
-        [0] name(2,9) : value(13,4) [instances]
     InDom 29.10[0] labels (0 bytes): 
     InDom 29.10[1] labels (0 bytes): 
     InDom 29.12[1] labels (0 bytes): 

src/libpcp/src/logmeta.c

@@ -416,16 +416,24 @@ samelabelset(const pmLabelSet *set1, const pmLabelSet *set2)
 
 /*
  * Discard any label sets within idp which are also within idp_next.
- * Instance labels are a special case which cannot be reduced due to
- * the potentially dynamic nature of the associated instance domain.
+ * Instance labels are a special case which cannot be reduced unless
+ * both complete sets match exactly, due to the potentially dynamic
+ * nature of the associated instance domain.
  */
 static void
 discard_dup_labelsets(__pmLogLabelSet *idp, const __pmLogLabelSet *idp_next)
 {
     int			i, j;
 
-    if (idp->type & PM_LABEL_INSTANCES)
-	return;
+    if (idp->type & PM_LABEL_INSTANCES) {
+	if (idp->nsets != idp_next->nsets)
+	    return;
+	for (i = 0; i < idp->nsets; ++i) {
+	    if (samelabelset(&idp->labelsets[i], &idp_next->labelsets[i]))
+		continue;
+	    return;
+	}
+    }
 
     for (i = 0; i < idp->nsets; ++i) {
 	for (j = 0; j < idp_next->nsets; ++j) {