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+ Notifications center - 502 error
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+╔═════════════════════════════════════════════════════════════════════════╗
+║ ║
+║ Nasqueron - Notifications center ║
+║ ║
+╚═════════════════════════════════════════════════════════════════════════╝
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+╔═════════════════════════════════════════════════════════════════════════╗
+║ ║
+║ +---------------+ ║
+║ | | ║
+║ | 502 | +----------------------+ ║
+║ | +---------------------------> | | ║
+║ | Gateway not | | Please retry | ║
+║ | responsive. +------------+ | in a few | ║
+║ | || | | minutes. | ║
+║ +----+----------| +--------------------------+ | ║
+║ | || | | | | If not, check | ║
+║ | +------------+ | | our status | ║
+║ | | | Some systems | | or request | ║
+║ | | | could emit | | support. | ║
+║ | | | notifications. | | | ║
+║ | | | | | | ║
+║ | +-------------------+ +----------------------+ ║
+║ | | | | | | ║
+║ | | | | | They propagate | +++ ║
+║ +----------+ | | events for other | +---------->-+++ ║
+║ | | | systems and apps. | +++ ║
+║ | | | | | ║
+║ | | | +-------------------------+ | ║
+║ | | | | | | | ║
+║ | +--------------------------+ | | ║
+║ | | | | | ║
+║ +---------------------------------+ Other receive | <----+ ║
+║ || | | | them. Even | ║
+║ || | | | sometimes handle | ║
+║ +--------------------+ | | them. | ║
+║ | | | | ║
+║ | | | | ║
+║ | +-------------------------+ ║
+║ | | ║
+║ +---------------------------------+ ║
+║ ║
+╚═════════════════════════════════════════════════════════════════════════╝
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