RFR: bot: add liveness handler

[Erik Joelsson]

On Wed, 12 May 2021 19:35:16 GMT, Erik Helin <ehelin at openjdk.org> wrote:

> Hi all,
> 
> please review this patch that adds a liveness handler to the bot runner's HTTP server. The liveness handler, typically acting on the `/healthz` path, returns `200` if everything is well and `500` otherwise.
> 
> Thanks,
> Erik

bot/src/main/java/org/openjdk/skara/bot/BotRunner.java line 241:

> 239: 
> 240:     boolean isHealthy() {
> 241:         return true;

I think this implementation is a tad optimistic regarding the health of the runner. :) But I also think defining healthy can be tricky.

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PR: https://git.openjdk.java.net/skara/pull/1155