docs: private Result sessionInfoForSession(String sessionId) {
  
          Map<String, Object> dataEachSession = new HashMap<>();
          StatsStorage ss = knownSessionIDs.get(sessionId);
          if (ss != null) {
              Map<String, Object> dataThisSession = sessionData(sessionId, ss);
              dataEachSession.put(sessionId, dataThisSession);
          }
          return Results.ok(asJson(dataEachSession)).as("application/json");
      }