eureka-core/src/main/java/com/netflix/eureka/registry/AbstractInstanceRegistry.java [495:526]:
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                    if (lastDirtyTimestamp != null) {
                        replicaDirtyTimestamp = Long.parseLong(lastDirtyTimestamp);
                    }
                    // If the replication's dirty timestamp is more than the existing one, just update
                    // it to the replica's.
                    if (replicaDirtyTimestamp > info.getLastDirtyTimestamp()) {
                        info.setLastDirtyTimestamp(replicaDirtyTimestamp);
                    }
                    info.setActionType(ActionType.MODIFIED);
                    recentlyChangedQueue.add(new RecentlyChangedItem(lease));
                    info.setLastUpdatedTimestamp();
                    invalidateCache(appName, info.getVIPAddress(), info.getSecureVipAddress());
                }
                return true;
            }
        } finally {
            read.unlock();
        }
    }

    /**
     * Removes status override for a give instance.
     *
     * @param appName the application name of the instance.
     * @param id the unique identifier of the instance.
     * @param newStatus the new {@link InstanceStatus}.
     * @param lastDirtyTimestamp last timestamp when this instance information was updated.
     * @param isReplication true if this is a replication event from other nodes, false
     *                      otherwise.
     * @return true if the status was successfully updated, false otherwise.
     */
    @Override
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eureka-core/src/main/java/com/netflix/eureka/registry/AbstractInstanceRegistry.java [556:581]:
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                    if (lastDirtyTimestamp != null) {
                        replicaDirtyTimestamp = Long.parseLong(lastDirtyTimestamp);
                    }
                    // If the replication's dirty timestamp is more than the existing one, just update
                    // it to the replica's.
                    if (replicaDirtyTimestamp > info.getLastDirtyTimestamp()) {
                        info.setLastDirtyTimestamp(replicaDirtyTimestamp);
                    }
                    info.setActionType(ActionType.MODIFIED);
                    recentlyChangedQueue.add(new RecentlyChangedItem(lease));
                    info.setLastUpdatedTimestamp();
                    invalidateCache(appName, info.getVIPAddress(), info.getSecureVipAddress());
                }
                return true;
            }
        } finally {
            read.unlock();
        }
    }

    /**
     * Evicts everything in the instance registry that has expired, if expiry is enabled.
     *
     * @see com.netflix.eureka.lease.LeaseManager#evict()
     */
    @Override
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