Werk #12857: slack: Add option to configure proxy

Component	Notifications
Title	slack: Add option to configure proxy
Date	Apr 30, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p24 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The option "HTTP proxy" was added for notification method "Slack or Mattermost".

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