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Second iteration on PostgreSQL monitoring POC - Read-Only Support #4726

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Second iteration on PostgreSQL monitoring POC - Read-Only Support #4726

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Commits on Oct 24, 2024

  1. This commit packs multiple fixes/improvements: 

    - Added READONLY support for PostgreSQL.
- Major rework for queries and statements used on monitoring tables:
    + Checks/Actions rewrote for single instance checks.
    + Reuse of prepared statements instance of re-preparation.
- Fixed missing error handling in connection creation state machine.
- Added support for configurable batching in scheduler thread, via
  '*_interval_window' variables. These variables allows to define the
  burstiness of the scheduling within the processing interval.
- Several fixes for 'poll' timeout computation for worker threads.
- Fixed edge cases for current interval detection.
- Reduced deviation in scheduling intervals computation.
- Refactored and simplified connection event handling.
- Honor '-M' argument for disabling monitoring support.
    @JavierJF
    JavierJF committed Oct 24, 2024
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  2. Fix read-after-free in 'proxy_debug' for 'process_startup_packet'

    @JavierJF
    JavierJF committed Oct 24, 2024
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