In Exposure Config master file: Value for Duration Risk 10< D <= 15 minutes is not set correctly (1 instead of 0)

Describe the bug

Currently, exposure is also assumed for contact with duration more than 10 minutes to 15 minutes in the exposure config file https://github.com/corona-warn-app/cwa-server/blob/eb8be6c3e9c723c62c619784e41889d10054cc93/services/distribution/src/main/resources/master-config/exposure-config.yaml#L34

Expected behaviour

Exposure should only be considered when duration of contact was more than 15 minutes and risk level value for 10< D <= 15 should be set to 0: gt_10_le_15_min: 0

Possible Fix

Change line 34: duration: eq_0_min: 0 gt_0_le_5_min: 0 gt_5_le_10_min: 0 **gt_10_le_15_min: 0** gt_15_le_20_min: 1 gt_20_le_25_min: 1 gt_25_le_30_min: 1 gt_30_min: 1

Additional context

It is widely communicated that the minimum duration of a contact to be considered for contact tracing is more than 15 minutes (see e.g. by WHO https://www.who.int/publications/i/item/contact-tracing-in-the-context-of-covid-19). This was also repeatedly mentioned in the press conference today by Lothar Wieler (https://www.youtube.com/watch?v=GDnaNMGbXnw e.g. minute 48:30).

[twenta]

From reading the documentation (sorry couldn’t find it before), it becomes clear that exposures between 10-15 min are further evaluated and taken into account in case the attenuation suggest a very close contact during this time. So this very likely not a bug.

the time remains unchanged if this risk is estimated as average (for risk exposures), it is extended to one and a half times if the risk is above average, and it is reduced significantly (to around one-sixth) if the risk is below average. As a result, an exposure time of 10 minutes can be extended to more than 15 minutes and an exposure time of 45 minutes can be reduced to less than 10 minutes. https://github.com/corona-warn-app/cwa-documentation/blob/master/cwa-risk-assessment.md

[pdehaye]

@corneliusroemer I do agree the setting of those parameters is extremely important. For this reason I have consolidated all the outstanding questions, to the best of my ability, in corona-warn-app/cwa-documentation#336.