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Fix: Skip the non-exist namespaces when there are multiple mongo instance metrics to scrape #1146

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Fix: Skip the non-exist namespaces when there are multiple mongo instance metrics to scrape #1146

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23c3c41
Fix: Skip the non-exist namespaces when there are multiple mongo inst…
LinPr Aug 13, 2025
b70a24b
Merge branch 'main' into check
LinPr Aug 23, 2025
2ac37cb
Fix: Skip the non-exist namespaces when there are multiple mongo inst…
LinPr Aug 26, 2025
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2 changes: 1 addition & 1 deletion exporter/collstats_collector.go
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Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@ func (d *collstatsCollector) collect(ch chan<- prometheus.Metric) {
collections = fromMapToSlice(onlyCollectionsNamespaces)
} else {
var err error
collections, err = checkNamespacesForViews(d.ctx, client, d.collections)
collections, err = checkNamespacesForViewsOrNonExist(d.ctx, client, d.collections, logger)
if err != nil {
logger.Error("cannot list collections", "error", err.Error())
return
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10 changes: 7 additions & 3 deletions exporter/common.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ package exporter
import (
"context"
"fmt"
"log/slog"
"sort"
"strings"

Expand Down Expand Up @@ -163,8 +164,8 @@ func unique(slice []string) []string {
return list
}

func checkNamespacesForViews(ctx context.Context, client *mongo.Client, collections []string) ([]string, error) {
onlyCollectionsNamespaces, err := listAllCollections(ctx, client, nil, nil, true)
func checkNamespacesForViewsOrNonExist(ctx context.Context, client *mongo.Client, collections []string, logger *slog.Logger) ([]string, error) {
onlyCollectionsNamespaces, err := listAllCollections(ctx, client, collections, nil, true)
if err != nil {
return nil, err
}
Expand All @@ -183,7 +184,10 @@ func checkNamespacesForViews(ctx context.Context, client *mongo.Client, collecti
}

if _, ok := namespaces[collection]; !ok {
return nil, errors.Errorf("namespace %s is a view and cannot be used for collstats/indexstats", collection)
if logger != nil {
logger.Warn("namespace is a view or does not exist, cannot be used for collstats/indexstats", "namespace", collection)
}
continue
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let's log that we are skipping this collection

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yeah good idea

}

filteredCollections = append(filteredCollections, collection)
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9 changes: 5 additions & 4 deletions exporter/common_test.go
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Expand Up @@ -198,13 +198,14 @@ func TestCheckNamespacesForViews(t *testing.T) {
setupDB(ctx, t, client)
defer cleanupDB(ctx, client)

t.Run("Views in provided collection list (should fail)", func(t *testing.T) {
_, err := checkNamespacesForViews(ctx, client, []string{"testdb01.col01", "testdb01.system.views", "testdb01.view01"})
assert.EqualError(t, err, "namespace testdb01.view01 is a view and cannot be used for collstats/indexstats")
t.Run("Views or non-exist namespace in provided collection list (should fail)", func(t *testing.T) {
filtered, err := checkNamespacesForViewsOrNonExist(ctx, client, []string{"testdb01.col01", "testdb01.system.views", "testdb01.non_existent"}, nil)
assert.NoError(t, err)
assert.Equal(t, []string{"testdb01.col01"}, filtered)
})

t.Run("No Views in provided collection list", func(t *testing.T) {
filtered, err := checkNamespacesForViews(ctx, client, []string{"testdb01.col01", "testdb01.system.views"})
filtered, err := checkNamespacesForViewsOrNonExist(ctx, client, []string{"testdb01.col01", "testdb01.system.views"}, nil)
assert.NoError(t, err)
assert.Equal(t, []string{"testdb01.col01", "testdb01.system.views"}, filtered)
})
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2 changes: 1 addition & 1 deletion exporter/indexstats_collector.go
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Original file line number Diff line number Diff line change
Expand Up @@ -77,7 +77,7 @@ func (d *indexstatsCollector) collect(ch chan<- prometheus.Metric) {
collections = fromMapToSlice(onlyCollectionsNamespaces)
} else {
var err error
collections, err = checkNamespacesForViews(d.ctx, client, d.collections)
collections, err = checkNamespacesForViewsOrNonExist(d.ctx, client, d.collections, logger)
if err != nil {
logger.Error("cannot list collections", "error", err.Error())

Expand Down