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I didn't find this in the documentation - is there some limit on the number of custom parameter a custom event might have?
The documentation does mention a limit of 25 user custom parameters, but what about event custom parameters - is there a similar limit?
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Event parameter restrictions: You can define a maximum of 25 parameters for each event, and a maximum of 100 event parameters for each project.
In Analytics for Firebase, navigate to your app. Click Events. In the row for the event you want to modify, click More > Edit parameter reporting. In the Enter parameter name field, enter the name of the parameter you'd like to register.
You can enable up to 30 events per project as conversions, in addition to the five that Analytics defines by default.
Params supply information that contextualize Events. You can associate up to 25 unique Params with each Event type. Some Params are suggested below for certain common Events, but you are not limited to these. You may supply extra Params for suggested Events or custom Params for Custom events.
I collect the information based on all the official documentation, hope you helps
parameters per event - Source
parameters per project - Source
parameters only 40 must be numeric (Long, Double) and 10 textual (String) values - Source
Parameter names can be up to 40 characters long alfanumeric with underscores - Source
Parameter textual values can be up to 100 characters long - Source
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