[Feature Request]: Introduce metrics for number of backed and included candidates

[kamilsa]

Component

Other

Feature Description

We need a metrics that would reflect:

1. The total number of backed candidates inherents in our blocks
2. The total number of included candidates inherents in our blocks
3. The total number of blocks we procuded

References and additional Information

No response

[igor-egorov]

I suggest to add three more metrics:

• blocks without included candidates
• blocks without backed candidates
• blocks without both included and backed candidates at the same time