Change vocab from instances to indices / index

Signed-off-by: Sébastien Coavoux <sebastien.coavoux@azoplee.com>

collector/collector.go

@@ -181,16 +181,16 @@ func ScrapeTarget(ctx context.Context, target string, config *config.Module, log
 			continue
 		}
 
-		allowedList = filterAllowedInstances(logger, filter, pdus, allowedList)
+		allowedList = filterAllowedIndices(logger, filter, pdus, allowedList)
 
-		// Update config to get only instance and not walk them
+		// Update config to get only index and not walk them
 		newWalk = updateWalkConfig(newWalk, filter, logger)
 
-		// Only Keep instance not involved in filters
+		// Only Keep indices not involved in filters
 		newCfg := updateGetConfig(newGet, filter, logger)
 
-		// We now add each instance from filter to the get list
-		newCfg = addAllowedInstances(filter, allowedList, logger, newCfg)
+		// We now add each index from filter to the get list
+		newCfg = addAllowedIndices(filter, allowedList, logger, newCfg)
 
 		newGet = newCfg
 	}
@@ -261,7 +261,7 @@ func ScrapeTarget(ctx context.Context, target string, config *config.Module, log
 	return results, nil
 }
 
-func filterAllowedInstances(logger log.Logger, filter config.DynamicFilter, pdus []gosnmp.SnmpPDU, allowedList []string) []string {
+func filterAllowedIndices(logger log.Logger, filter config.DynamicFilter, pdus []gosnmp.SnmpPDU, allowedList []string) []string {
 	level.Debug(logger).Log("msg", "Evaluating rule for oid", "oid", filter.Oid)
 	for _, pdu := range pdus {
 		found := false
@@ -276,9 +276,9 @@ func filterAllowedInstances(logger log.Logger, filter config.DynamicFilter, pdus
 		}
 		if found {
 			pduArray := strings.Split(pdu.Name, ".")
-			instance := pduArray[len(pduArray)-1]
-			level.Debug(logger).Log("msg", "Caching instance", "instance", instance)
-			allowedList = append(allowedList, instance)
+			index := pduArray[len(pduArray)-1]
+			level.Debug(logger).Log("msg", "Caching index", "index", index)
+			allowedList = append(allowedList, index)
 		}
 	}
 	return allowedList
@@ -324,11 +324,11 @@ func updateGetConfig(getConfig []string, filter config.DynamicFilter, logger log
 	return newCfg
 }
 
-func addAllowedInstances(filter config.DynamicFilter, allowedList []string, logger log.Logger, newCfg []string) []string {
+func addAllowedIndices(filter config.DynamicFilter, allowedList []string, logger log.Logger, newCfg []string) []string {
 	for _, targetOid := range filter.Targets {
-		for _, instance := range allowedList {
-			level.Debug(logger).Log("msg", "Adding get configuration", "oid", targetOid+"."+instance)
-			newCfg = append(newCfg, targetOid+"."+instance)
+		for _, index := range allowedList {
+			level.Debug(logger).Log("msg", "Adding get configuration", "oid", targetOid+"."+index)
+			newCfg = append(newCfg, targetOid+"."+index)
 		}
 	}
 	return newCfg

config/config.go

@@ -194,8 +194,8 @@ type Filters struct {
 }
 
 type StaticFilter struct {
-	Targets   []string `yaml:"targets,omitempty"`
-	Instances []string `yaml:"instances,omitempty"`
+	Targets []string `yaml:"targets,omitempty"`
+	Indices []string `yaml:"indices,omitempty"`
 }
 type DynamicFilter struct {
 	Oid     string   `yaml:"oid"`

generator/README.md

@@ -147,23 +147,23 @@ modules:
                              #   EnumAsStateSet: An enum with a time series per state. Good for variable low-cardinality enums.
                              #   Bits: An RFC 2578 BITS construct, which produces a StateSet with a time series per bit.
 
-    filters: # Define filters to collect only a subset of OID table instances
-      static: # static filters are handled in the generator. They will convert walks to multiple gets with the specified instances
+    filters: # Define filters to collect only a subset of OID table indices
+      static: # static filters are handled in the generator. They will convert walks to multiple gets with the specified indices
               # in the resulting snmp.yml output.
-              # the instance filter will reduce a walk of a table to only the defined instances to get
+              # the index filter will reduce a walk of a table to only the defined indices to get
               # If one of the target OIDs is used in a lookup, the filter will apply ALL tables using this lookup
               # For a network switch, this could be used to collect a subset of interfaces such as uplinks
               # For a router, this could be used to collect all real ports but not vlans and other virtual interfaces
               # Specifying ifAlias or ifName if they are used in lookups with ifIndex will apply to the filter to 
               # all the OIDs that depend on the lookup, such as ifSpeed, ifInHcOctets, etc.
-              # This feature applies to any table(s) OIDs using a common instance
+              # This feature applies to any table(s) OIDs using a common index
         - targets:
           - bsnDot11EssSsid
-          instances: ["2","3","4"]  # List of interface instances to get
+          indices: ["2","3","4"]  # List of interface indices to get
 
       dynamic: # dynamic filters are handed by the snmp exporter. The generator will simply pass on the configuration in the snmp.yml.
                # The exporter will do a snmp walk of the oid and will restrict snmp walk made on the targets
-               # to the instance matching the value in the values list.
+               # to the index matching the value in the values list.
                # This would be typically used to specify a filter for interfaces with a certain name in ifAlias, ifSpeed or admin status.
                # For example, only get interfaces that a gig and faster, or get interfaces that are named Up or interfaces that are admin Up
         - oid: 1.3.6.1.2.1.2.2.1.7

generator/tree.go

@@ -385,7 +385,7 @@ func generateConfigModule(cfg *ModuleConfig, node *Node, nameToNode map[string]*
 			if ok {
 				oid = n.Oid
 			}
-			filterMap[oid] = filter.Instances
+			filterMap[oid] = filter.Indices
 		}
 	}
 
@@ -447,11 +447,11 @@ func generateConfigModule(cfg *ModuleConfig, node *Node, nameToNode map[string]*
 					needToWalk[indexNode.Oid] = struct{}{}
 				}
 				// we apply the same filter to metric.Oid if the lookup oid is filtered
-				instances, found := filterMap[indexNode.Oid]
+				indices, found := filterMap[indexNode.Oid]
 				if found {
 					delete(needToWalk, metric.Oid)
-					for _, instance := range instances {
-						needToWalk[metric.Oid+"."+instance+"."] = struct{}{}
+					for _, index := range indices {
+						needToWalk[metric.Oid+"."+index+"."] = struct{}{}
 					}
 				}
 				if lookup.DropSourceIndexes {
@@ -516,8 +516,8 @@ func generateConfigModule(cfg *ModuleConfig, node *Node, nameToNode map[string]*
 				oid = n.Oid
 			}
 			delete(needToWalk, oid)
-			for _, instance := range filter.Instances {
-				needToWalk[oid+"."+instance+"."] = struct{}{}
+			for _, index := range filter.Indices {
+				needToWalk[oid+"."+index+"."] = struct{}{}
 			}
 		}
 	}