There's also Signoz (https://signoz.io) a YC-backed company but open source with (recently) paid hosted.
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Looked interesting so I did what I try to do every time, checked the license.
Among other licenses I found this in one of the sub folders (/EE).
> This software and associated documentation files (the "Software") may only be used in production, if you (and any entity that you represent) have agreed to, and are in compliance with, the SigNoz Subscription Terms of Service, available via email (hello@signoz.io) (the "Enterprise Terms"), or other agreement governing the use of the Software, as agreed by you and SigNoz, and otherwise have a valid SigNoz Enterprise license for the correct number of user seats. [...]
I guess it is for enterprise edition or something but it was not immediately obvious to me what parts are under EE and which parts are under the MIT Expat license.
The base license seems like an MIT style license; with the comment that 'things in an ee/ directory are goverend by the license in that directory' -- so Amazon will just rewrite only that functionality when / if they decide to eat signoz's lunch.
Top level license:
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.