diff --git a/include/pcmki/pcmki_transition.h b/include/pcmki/pcmki_transition.h
index ee66fae724..12c87ecdc0 100644
--- a/include/pcmki/pcmki_transition.h
+++ b/include/pcmki/pcmki_transition.h
@@ -1,143 +1,143 @@
 /*
- * Copyright 2004-2019 the Pacemaker project contributors
+ * Copyright 2004-2021 the Pacemaker project contributors
  *
  * The version control history for this file may have further details.
  *
  * This source code is licensed under the GNU Lesser General Public License
  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
  */
 
 #ifndef CRM_TRANSITION__H
 #  define CRM_TRANSITION__H
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 #include <glib.h>
 #include <crm/crm.h>
 #include <crm/msg_xml.h>
 #include <crm/common/xml.h>
 
 typedef enum {
     action_type_pseudo,
     action_type_rsc,
     action_type_crm
 } action_type_e;
 
 typedef struct te_timer_s crm_action_timer_t;
 typedef struct crm_graph_s crm_graph_t;
 
 typedef struct synapse_s {
     int id;
     int priority;
 
     gboolean ready;
     gboolean failed;
     gboolean executed;
     gboolean confirmed;
 
     GListPtr actions;           /* crm_action_t* */
     GListPtr inputs;            /* crm_action_t* */
 } synapse_t;
 
 typedef struct crm_action_s {
     int id;
     int timeout;
     guint interval_ms;
     GHashTable *params;
     action_type_e type;
 
     crm_action_timer_t *timer;
     synapse_t *synapse;
 
     gboolean sent_update;       /* sent to the CIB */
     gboolean executed;          /* sent to the CRM */
     gboolean confirmed;
 
     gboolean failed;
-    gboolean can_fail;
+    gboolean can_fail; //! \deprecated Will be removed in a future release
 
     xmlNode *xml;
 
 } crm_action_t;
 
 struct te_timer_s {
     int source_id;
     int timeout;
     crm_action_t *action;
 };
 
 /* order matters here */
 enum transition_action {
     tg_done,
     tg_stop,
     tg_restart,
     tg_shutdown,
 };
 
 struct crm_graph_s {
     int id;
     char *source;
     int abort_priority;
 
     gboolean complete;
     const char *abort_reason;
     enum transition_action completion_action;
 
     int num_actions;
     int num_synapses;
 
     int batch_limit;
     guint network_delay;
     guint stonith_timeout;
 
     int fired;
     int pending;
     int skipped;
     int completed;
     int incomplete;
 
     GListPtr synapses;          /* synapse_t* */
 
     int migration_limit;
 };
 
 typedef struct crm_graph_functions_s {
     gboolean(*pseudo) (crm_graph_t * graph, crm_action_t * action);
     gboolean(*rsc) (crm_graph_t * graph, crm_action_t * action);
     gboolean(*crmd) (crm_graph_t * graph, crm_action_t * action);
     gboolean(*stonith) (crm_graph_t * graph, crm_action_t * action);
     gboolean(*allowed) (crm_graph_t * graph, crm_action_t * action);
 } crm_graph_functions_t;
 
 enum transition_status {
     transition_active,
     transition_pending,         /* active but no actions performed this time */
     transition_complete,
     transition_stopped,
     transition_terminated,
     transition_action_failed,
     transition_failed,
 };
 
 void set_default_graph_functions(void);
 void set_graph_functions(crm_graph_functions_t * fns);
 crm_graph_t *unpack_graph(xmlNode * xml_graph, const char *reference);
 int run_graph(crm_graph_t * graph);
 gboolean update_graph(crm_graph_t * graph, crm_action_t * action);
 void destroy_graph(crm_graph_t * graph);
 const char *transition_status(enum transition_status state);
 void print_graph(unsigned int log_level, crm_graph_t * graph);
 void print_action(int log_level, const char *prefix, crm_action_t * action);
 bool update_abort_priority(crm_graph_t * graph, int priority,
                            enum transition_action action, const char *abort_reason);
 const char *actiontype2text(action_type_e type);
 lrmd_event_data_t *convert_graph_action(xmlNode * resource, crm_action_t * action, int status,
                                         int rc);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif
diff --git a/lib/pacemaker/pcmk_trans_unpack.c b/lib/pacemaker/pcmk_trans_unpack.c
index db7dadd516..bf9d6baaf0 100644
--- a/lib/pacemaker/pcmk_trans_unpack.c
+++ b/lib/pacemaker/pcmk_trans_unpack.c
@@ -1,338 +1,344 @@
 /*
- * Copyright 2004-2020 the Pacemaker project contributors
+ * Copyright 2004-2021 the Pacemaker project contributors
  *
  * The version control history for this file may have further details.
  *
  * This source code is licensed under the GNU Lesser General Public License
  * version 2.1 or later (LGPLv2.1+) WITHOUT ANY WARRANTY.
  */
 
 #include <crm_internal.h>
 
 #include <sys/param.h>
 #include <sys/stat.h>
 
 #include <crm/crm.h>
 #include <crm/msg_xml.h>
 #include <crm/common/xml.h>
 #include <crm/common/xml_internal.h>
 #include <pacemaker-internal.h>
 
 static crm_action_t *
 unpack_action(synapse_t * parent, xmlNode * xml_action)
 {
     crm_action_t *action = NULL;
     const char *value = crm_element_value(xml_action, XML_ATTR_ID);
 
     if (value == NULL) {
         crm_err("Actions must have an id!");
         crm_log_xml_trace(xml_action, "Action with missing id");
         return NULL;
     }
 
     action = calloc(1, sizeof(crm_action_t));
     if (action == NULL) {
         crm_perror(LOG_CRIT, "Cannot unpack action");
         crm_log_xml_trace(xml_action, "Lost action");
         return NULL;
     }
 
     action->id = crm_parse_int(value, NULL);
     action->type = action_type_rsc;
     action->xml = copy_xml(xml_action);
     action->synapse = parent;
 
     if (pcmk__str_eq(crm_element_name(action->xml), XML_GRAPH_TAG_RSC_OP, pcmk__str_casei)) {
         action->type = action_type_rsc;
 
     } else if (pcmk__str_eq(crm_element_name(action->xml), XML_GRAPH_TAG_PSEUDO_EVENT, pcmk__str_casei)) {
         action->type = action_type_pseudo;
 
     } else if (pcmk__str_eq(crm_element_name(action->xml), XML_GRAPH_TAG_CRM_EVENT, pcmk__str_casei)) {
         action->type = action_type_crm;
     }
 
     action->params = xml2list(action->xml);
 
     value = g_hash_table_lookup(action->params, "CRM_meta_timeout");
     if (value != NULL) {
         action->timeout = crm_parse_int(value, NULL);
     }
 
     /* Take start-delay into account for the timeout of the action timer */
     value = g_hash_table_lookup(action->params, "CRM_meta_start_delay");
     if (value != NULL) {
         action->timeout += crm_parse_int(value, NULL);
     }
 
     if (pcmk__guint_from_hash(action->params,
                               CRM_META "_" XML_LRM_ATTR_INTERVAL, 0,
                               &(action->interval_ms)) != pcmk_rc_ok) {
         action->interval_ms = 0;
     }
 
     value = g_hash_table_lookup(action->params, "CRM_meta_can_fail");
     if (value != NULL) {
         crm_str_to_boolean(value, &(action->can_fail));
+#ifndef PCMK__COMPAT_2_0
+        if (action->can_fail) {
+            crm_warn("Support for the can_fail meta-attribute is deprecated"
+                     " and will be removed in a future release");
+        }
+#endif
     }
 
     crm_trace("Action %d has timer set to %dms", action->id, action->timeout);
 
     return action;
 }
 
 static synapse_t *
 unpack_synapse(crm_graph_t * new_graph, xmlNode * xml_synapse)
 {
     const char *value = NULL;
     xmlNode *inputs = NULL;
     xmlNode *action_set = NULL;
     synapse_t *new_synapse = NULL;
 
     CRM_CHECK(xml_synapse != NULL, return NULL);
     crm_trace("looking in synapse %s", ID(xml_synapse));
 
     new_synapse = calloc(1, sizeof(synapse_t));
     new_synapse->id = crm_parse_int(ID(xml_synapse), NULL);
 
     value = crm_element_value(xml_synapse, XML_CIB_ATTR_PRIORITY);
     if (value != NULL) {
         new_synapse->priority = crm_parse_int(value, NULL);
     }
 
     CRM_CHECK(new_synapse->id >= 0, free(new_synapse);
               return NULL);
 
     new_graph->num_synapses++;
 
     crm_trace("look for actions in synapse %s", crm_element_value(xml_synapse, XML_ATTR_ID));
 
     for (action_set = pcmk__xml_first_child(xml_synapse); action_set != NULL;
          action_set = pcmk__xml_next(action_set)) {
 
         if (pcmk__str_eq((const char *)action_set->name, "action_set",
                          pcmk__str_none)) {
             xmlNode *action = NULL;
 
             for (action = pcmk__xml_first_child(action_set); action != NULL;
                  action = pcmk__xml_next(action)) {
                 crm_action_t *new_action = unpack_action(new_synapse, action);
 
                 if (new_action == NULL) {
                     continue;
                 }
 
                 new_graph->num_actions++;
 
                 crm_trace("Adding action %d to synapse %d", new_action->id, new_synapse->id);
 
                 new_synapse->actions = g_list_append(new_synapse->actions, new_action);
             }
         }
     }
 
     crm_trace("look for inputs in synapse %s", ID(xml_synapse));
 
     for (inputs = pcmk__xml_first_child(xml_synapse); inputs != NULL;
          inputs = pcmk__xml_next(inputs)) {
 
         if (pcmk__str_eq((const char *)inputs->name, "inputs", pcmk__str_none)) {
             xmlNode *trigger = NULL;
 
             for (trigger = pcmk__xml_first_child(inputs); trigger != NULL;
                  trigger = pcmk__xml_next(trigger)) {
                 xmlNode *input = NULL;
 
                 for (input = pcmk__xml_first_child(trigger); input != NULL;
                      input = pcmk__xml_next(input)) {
                     crm_action_t *new_input = unpack_action(new_synapse, input);
 
                     if (new_input == NULL) {
                         continue;
                     }
 
                     crm_trace("Adding input %d to synapse %d", new_input->id, new_synapse->id);
 
                     new_synapse->inputs = g_list_append(new_synapse->inputs, new_input);
                 }
             }
         }
     }
 
     return new_synapse;
 }
 
 static void destroy_action(crm_action_t * action);
 
 crm_graph_t *
 unpack_graph(xmlNode * xml_graph, const char *reference)
 {
 /*
   <transition_graph>
   <synapse>
   <action_set>
   <rsc_op id="2"
   ...
   <inputs>
   <rsc_op id="2"
   ...
 */
     crm_graph_t *new_graph = NULL;
     const char *t_id = NULL;
     const char *time = NULL;
     xmlNode *synapse = NULL;
 
     new_graph = calloc(1, sizeof(crm_graph_t));
 
     new_graph->id = -1;
     new_graph->abort_priority = 0;
     new_graph->network_delay = 0;
     new_graph->stonith_timeout = 0;
     new_graph->completion_action = tg_done;
 
     if (reference) {
         new_graph->source = strdup(reference);
     } else {
         new_graph->source = strdup("unknown");
     }
 
     if (xml_graph != NULL) {
         t_id = crm_element_value(xml_graph, "transition_id");
         CRM_CHECK(t_id != NULL, free(new_graph);
                   return NULL);
         new_graph->id = crm_parse_int(t_id, "-1");
 
         time = crm_element_value(xml_graph, "cluster-delay");
         CRM_CHECK(time != NULL, free(new_graph);
                   return NULL);
         new_graph->network_delay = crm_parse_interval_spec(time);
 
         time = crm_element_value(xml_graph, "stonith-timeout");
         if (time == NULL) {
             new_graph->stonith_timeout = new_graph->network_delay;
         } else {
             new_graph->stonith_timeout = crm_parse_interval_spec(time);
         }
 
         t_id = crm_element_value(xml_graph, "batch-limit");
         new_graph->batch_limit = crm_parse_int(t_id, "0");
 
         t_id = crm_element_value(xml_graph, "migration-limit");
         new_graph->migration_limit = crm_parse_int(t_id, "-1");
     }
 
     for (synapse = pcmk__xml_first_child(xml_graph); synapse != NULL;
          synapse = pcmk__xml_next(synapse)) {
 
         if (pcmk__str_eq((const char *)synapse->name, "synapse", pcmk__str_none)) {
             synapse_t *new_synapse = unpack_synapse(new_graph, synapse);
 
             if (new_synapse != NULL) {
                 new_graph->synapses = g_list_append(new_graph->synapses, new_synapse);
             }
         }
     }
 
     crm_debug("Unpacked transition %d: %d actions in %d synapses",
               new_graph->id, new_graph->num_actions, new_graph->num_synapses);
 
     return new_graph;
 }
 
 static void
 destroy_action(crm_action_t * action)
 {
     if (action->timer && action->timer->source_id != 0) {
         crm_warn("Cancelling timer for action %d (src=%d)", action->id, action->timer->source_id);
         g_source_remove(action->timer->source_id);
     }
     if (action->params) {
         g_hash_table_destroy(action->params);
     }
     free_xml(action->xml);
     free(action->timer);
     free(action);
 }
 
 static void
 destroy_synapse(synapse_t * synapse)
 {
     while (synapse->actions != NULL) {
         crm_action_t *action = g_list_nth_data(synapse->actions, 0);
 
         synapse->actions = g_list_remove(synapse->actions, action);
         destroy_action(action);
     }
 
     while (synapse->inputs != NULL) {
         crm_action_t *action = g_list_nth_data(synapse->inputs, 0);
 
         synapse->inputs = g_list_remove(synapse->inputs, action);
         destroy_action(action);
     }
     free(synapse);
 }
 
 void
 destroy_graph(crm_graph_t * graph)
 {
     if (graph == NULL) {
         return;
     }
     while (graph->synapses != NULL) {
         synapse_t *synapse = g_list_nth_data(graph->synapses, 0);
 
         graph->synapses = g_list_remove(graph->synapses, synapse);
         destroy_synapse(synapse);
     }
 
     free(graph->source);
     free(graph);
 }
 
 lrmd_event_data_t *
 convert_graph_action(xmlNode * resource, crm_action_t * action, int status, int rc)
 {
     xmlNode *xop = NULL;
     lrmd_event_data_t *op = NULL;
     GHashTableIter iter;
     const char *name = NULL;
     const char *value = NULL;
     xmlNode *action_resource = NULL;
 
     CRM_CHECK(action != NULL, return NULL);
     CRM_CHECK(action->type == action_type_rsc, return NULL);
 
     action_resource = first_named_child(action->xml, XML_CIB_TAG_RESOURCE);
     CRM_CHECK(action_resource != NULL, crm_log_xml_warn(action->xml, "Bad");
               return NULL);
 
     op = lrmd_new_event(ID(action_resource),
                         crm_element_value(action->xml, XML_LRM_ATTR_TASK),
                         action->interval_ms);
     op->rc = rc;
     op->op_status = status;
     op->t_run = time(NULL);
     op->t_rcchange = op->t_run;
 
     op->params = g_hash_table_new_full(crm_str_hash, g_str_equal, free, free);
 
     g_hash_table_iter_init(&iter, action->params);
     while (g_hash_table_iter_next(&iter, (void **)&name, (void **)&value)) {
         g_hash_table_insert(op->params, strdup(name), strdup(value));
     }
 
     for (xop = pcmk__xml_first_child(resource); xop != NULL;
          xop = pcmk__xml_next(xop)) {
         int tmp = 0;
 
         crm_element_value_int(xop, XML_LRM_ATTR_CALLID, &tmp);
         crm_debug("Got call_id=%d for %s", tmp, ID(resource));
         if (tmp > op->call_id) {
             op->call_id = tmp;
         }
     }
 
     op->call_id++;
     return op;
 }