Get API in counters

[amiraskarieh]

Hi.
I want to use your library for my project.
But i want to use get api for our counters.
For example if the counter was set to 3. Now it is 5. But i do not know how much should I increase. I just know it should be set to 5. If I have a get api i can find that previous value was 3 and know I should increase it by 2.
But I can not find any get Api in opentelemetry-cpp.
If there is a solution for my problem help me. (Maybe using other counters or ...)
Note that I do not want to use gauge because it use abi version 2 (experimental)

[lalitb]

The Metrics API doesn’t provide a Get() method, as reading instrument values isn’t supported by spec. If you only know the latest value, consider using ObservableCounter (for additive metrics) or ObservableGauge / Gauge (for non-additive, point-in-time values), or track the previous value manually and use a regular Counter.

[amiraskarieh]

Thanks.
But I want something that be in abi version 1 and support decreasing. Also solve mu problem.
Observable Counter does not support decreasing.
Gauge/ observable gauge are in abi 2.