anmolbabu/rds_metrics: metrics/helper.go; 36 LoC

Found a possible issue in [anmolbabu/rds_metrics](https://www.github.com/anmolbabu/rds_metrics) at [metrics/helper.go](https://github.com/anmolbabu/rds_metrics/blob/9fc14db7b5964e3d1aa37c38588765271afeeb23/metrics/helper.go#L84-L119)

Below is the message reported by the analyzer for this snippet of code. Beware that the analyzer only reports the first
issue it finds, so please do not limit your consideration to the contents of the below message.

> range-loop variable metricFetcher used in defer or goroutine at line 87

[Click here to see the code in its original context.](https://github.com/anmolbabu/rds_metrics/blob/9fc14db7b5964e3d1aa37c38588765271afeeb23/metrics/helper.go#L84-L119)

Click here to show the 36 line(s) of Go which triggered the analyzer.

```go
for _, metricFetcher := range MetricFetchers {
go func() {
// execute the metricfetcher to get its corresponding clouwatch form
namespace, name, value, metaInfo, e := metricFetcher()
// if err is not nil, accummulate it and error and later instead of failing fast...
// So, that other metrics can be collected instead of failing completely for failure in collecting one/some
// of the metrics
if e != nil {
if err == nil {
err = e
return
} else {
err = fmt.Errorf("%s.%s", err, e.Error())
return
}
}

fmt.Println(namespace, name, value, metaInfo, e)

// Push the metric just collected
e = PushMetricToCloudWatch(namespace, name, value, metaInfo)
// If error accummulate error
if e != nil {
// ToDo(@Anmol Babu) handle the error concatenation better
if err == nil {
err = e
return
} else {
err = fmt.Errorf("%s.%s", err, e.Error())
return
}
}
// Signal completion of one routine to be waited on
wg.Done()
}()
}

```

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See the descriptions of the classifications [here](https://github.com/github-vet/rangeclosure-findings#how-can-i-help) for more information.

commit ID: 9fc14db7b5964e3d1aa37c38588765271afeeb23