RFR: bot: add exception type to counter [v2]

[Erik Helin]

> Hi all,
> 
> please review this small patch that adds the `exception` label to the `skara_runner_exceptions` counter. This is useful to be able to query for different kinds of exceptions when viewing this metric.
> 
> Thanks,
> Erik

Erik Helin has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/1170/files
  - new: https://git.openjdk.java.net/skara/pull/1170/files/e217a7cd..e217a7cd

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=1170&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=1170&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/1170.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1170/head:pull/1170

PR: https://git.openjdk.java.net/skara/pull/1170