Counter should start from 0

Current implementation is not following the below rule

https://prometheus.io/docs/practices/instrumentation/#avoid-missing-metrics

```
To avoid this, export 0 (or NaN, if 0 would be misleading) for any time series you know may exist in advance.
```

This is leading to situation's such as creating prometheus alert.
For example
```
rate(my_metric[1m]) > 0
```
Will not fire alert when my_metric=1 but instead my_metric > 2.
This is because my_metric does not start with 0 and start's with 1