[Feature Request]: Approvals no shows metric

[kamilsa]

Component

Parachains validation

Feature Description

Add metric kagome_parachain_approvals_no_shows_total.

Analogue to the polkadot_parachain_approvals_no_shows_total metric: counter that tracks the total number of assignments which became no-shows in the approval voting subsystem of a Polkadot parachain.
"A "no-show" occurs when a validator fails to submit their approval or rejection vote within the expected timeframe. This metric increments each time an assignment results in a no-show, providing insights into the reliability and responsiveness of validators in the approval checking process. Monitoring this metric can help identify issues with validator participation or network conditions that may affect the timely finalization of parachain blocks"

References and additional Information

No response