service: storage monitor added

[michalkucharczyk]

Storage monitor added. It uses notify create to get notifications about any changes to monitored path (which is database path). Notifications are consumed in essential task which terminates when available storage space drops below given threshold.

Closes: #12399

[michalkucharczyk]

/cmd queue -c fmt

[command-bot[bot]]

@michalkucharczyk https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/2245206 was started for your command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh". Check out https://gitlab.parity.io/parity/mirrors/substrate/-/pipelines?page=1&scope=all&username=group_605_bot to know what else is being executed currently.

Comment /cmd cancel 15-7cb2d0ee-32c2-441b-89cb-2b92dd6949c6 to cancel this command or /cmd cancel to cancel all commands in this pull request.

[command-bot[bot]]

@michalkucharczyk Command "$PIPELINE_SCRIPTS_DIR/commands/fmt/fmt.sh" has finished. Result: https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/2245206 has finished. If any artifacts were generated, you can download them from https://gitlab.parity.io/parity/mirrors/substrate/-/jobs/2245206/artifacts/download.

[michalkucharczyk]

bot rebase

[paritytech-processbot[bot]]

Rebased

[michalkucharczyk]

bot rebase

[paritytech-processbot[bot]]

Rebased

[michalkucharczyk]

bot merge