Web notification retention policy changes

We have increased our web notification retention policy to 5 months for all notification types.

Previously, our retention policy was set to a shorter time period.

You can no longer add new DSA keys (ssh-dss) to your GitHub account. Existing DSA keys are not affected and will continue to function. All GitHub Enterprise versions of 2.18 and prior will allow DSA keys to be added.

GitHub Enterprise 2.19 will no longer provide this functionality.

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