IN-2226: fix whitelist cpu and disk metrics (#100)

* fix: whitelist node cpu and disk metrics

* add .ignore file

.ignore

@@ -0,0 +1 @@
+vendor/

internal/log/log.go

@@ -5,15 +5,12 @@ import (
 	"log"
 	"log/syslog"
 	"os"
-
-	"github.com/pkg/errors"
 )
 
 // Level is a log level such a Debug or Error
 type Level int
 
 const (
-	initFailed  = "failed to initialize syslog logger"
 	syslogFlags = log.Llongfile
 	normalFlags = log.LUTC | log.Ldate | log.Ltime | log.Llongfile
 
@@ -39,13 +36,13 @@ func SetLevel(l Level) {
 func InitSyslog() (err error) {
 	dl, err := syslog.NewLogger(syslog.LOG_NOTICE, syslogFlags)
 	if err != nil {
-		return errors.Wrap(err, initFailed)
+		return fmt.Errorf("InitSyslog failed to initialize debug logger: %+v", err)
 	}
 	debuglog = dl
 
 	el, err := syslog.NewLogger(syslog.LOG_ERR, syslogFlags)
 	if err != nil {
-		return errors.Wrap(err, initFailed)
+		return fmt.Errorf("InitSyslog failed to initialize error logger: %+v", err)
 	}
 	errlog = el
 

pkg/collector/node.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"strings"
 
+	"github.com/digitalocean/do-agent/internal/log"
+
 	"github.com/pkg/errors"
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/node_exporter/collector"
@@ -20,6 +22,9 @@ var whitelist = []string{
 	"node_memory_swaptotal_bytes",
 	"node_filesystem_size_bytes",
 	"node_filesystem_free_bytes",
+	"node_disk_read_bytes_total",
+	"node_disk_written_bytes_total",
+	"node_cpu_seconds_total",
 	"node_load1",
 	"node_load5",
 	"node_load15",
@@ -75,6 +80,8 @@ func (n *NodeCollector) Collect(ch chan<- prometheus.Metric) {
 		for _, s := range whitelist {
 			if strings.Contains(d, fmt.Sprintf(`fqname: "%s"`, s)) {
 				ch <- m
+			} else {
+				log.Debug("Node metric not whitelisted. Ignoring: %q", d)
 			}
 		}
 	}