in src/main/java/com/googlesource/gerrit/plugins/healthcheck/check/BlockedThreadsSubCheck.java [45:53]
void collect(ThreadInfo info) {
String threadName = info.getThreadName();
if (!Strings.isNullOrEmpty(threadName) && threadName.startsWith(prefix)) {
total += 1;
if (Thread.State.BLOCKED == info.getThreadState()) {
blocked += 1;
}
}
}