Event timestamp truncated to seconds precision when exporting to StackDriver

[riccardomurri]

Hello!

It looks like the StackDriver sink of event-exporter truncates timestamps to the second, although both the internal metav1.Time values and the StackDriver Timestamp object allow nanosecond precision.

The reason for this seems to be the MarshalJSON() method in the vendorized package k8s.io/apimachinery/pkg/apis/meta/v1 which uses the time.RFC3339 format instead of RFC3339Nano:

// MarshalJSON implements the json.Marshaler interface.
func (t Time) MarshalJSON() ([]byte, error) {
    ...
    buf = t.UTC().AppendFormat(buf, time.RFC3339)
    buf = append(buf, '"')
    return buf, nil
}

Is there a reason for this truncation?

[serathius]

/cc @kawych